diff --git a/build.py b/build.py
index 56de46de..2b34668e 100644
--- a/build.py
+++ b/build.py
@@ -90,31 +90,27 @@ def build_xibless(dest='cocoa/autogen'):
         ('prioritize_dialog.py', 'PrioritizeDialog_UI'),
         ('result_window.py', 'ResultWindow_UI'),
         ('main_menu.py', 'MainMenu_UI'),
-        ('preferences_panel.py', 'PreferencesPanel_UI'),
+        ('details_panel.py', 'DetailsPanel_UI'),
+        ('details_panel_picture.py', 'DetailsPanelPicture_UI'),
     ]
     for srcname, dstname in FNPAIRS:
         xibless.generate(
-            op.join('cocoa', 'base', 'ui', srcname), op.join(dest, dstname),
+            op.join('cocoa', 'ui', srcname), op.join(dest, dstname),
             localizationTable='Localizable'
         )
-    # XXX This is broken
-    assert False
-    #  if edition == 'pe':
-    #      xibless.generate(
-    #          'cocoa/pe/ui/details_panel.py', op.join(dest, 'DetailsPanel_UI'),
-    #          localizationTable='Localizable'
-    #      )
-    #  else:
-    #      xibless.generate(
-    #          'cocoa/base/ui/details_panel.py', op.join(dest, 'DetailsPanel_UI'),
-    #          localizationTable='Localizable'
-    #      )
+    for appmode in ('standard', 'music', 'picture'):
+        xibless.generate(
+            op.join('cocoa', 'ui', 'preferences_panel.py'),
+            op.join(dest, 'PreferencesPanel%s_UI' % appmode.capitalize()),
+            localizationTable='Localizable',
+            args={'appmode': appmode},
+        )
 
 def build_cocoa(dev):
     print("Creating OS X app structure")
     app = cocoa_app()
     app_version = get_module_version('core')
-    cocoa_project_path = 'cocoa/se'
+    cocoa_project_path = 'cocoa'
     filereplace(op.join(cocoa_project_path, 'InfoTemplate.plist'), op.join('build', 'Info.plist'), version=app_version)
     app.create(op.join('build', 'Info.plist'))
     print("Building localizations")
@@ -156,8 +152,8 @@ def build_cocoa(dev):
     app.copy_executable('cocoa/build/dupeGuru')
     build_help()
     print("Copying resources and frameworks")
-    image_path = 'cocoa/se/dupeguru.icns'
-    resources = [image_path, 'cocoa/base/dsa_pub.pem', 'build/dg_cocoa.py', 'build/help']
+    image_path = 'cocoa/dupeguru.icns'
+    resources = [image_path, 'cocoa/dsa_pub.pem', 'build/dg_cocoa.py', 'build/help']
     app.copy_resources(*resources, use_symlinks=dev)
     app.copy_frameworks('build/Python', 'cocoalib/Sparkle.framework')
     print("Creating the run.py file")
@@ -197,7 +193,7 @@ def build_localizations(ui):
     loc.compile_all_po('locale')
     if ui == 'cocoa':
         app = cocoa_app()
-        loc.build_cocoa_localizations(app, en_stringsfile=op.join('cocoa', 'base', 'en.lproj', 'Localizable.strings'))
+        loc.build_cocoa_localizations(app, en_stringsfile=op.join('cocoa', 'en.lproj', 'Localizable.strings'))
         locale_dest = op.join(app.resources, 'locale')
     elif ui == 'qt':
         build_qt_localizations()
@@ -212,7 +208,7 @@ def build_updatepot():
         build_cocoalib_xibless('cocoalib/autogen')
         loc.generate_cocoa_strings_from_code('cocoalib', 'cocoalib/en.lproj')
         build_xibless('se', op.join('cocoa', 'autogen', 'se'))
-        loc.generate_cocoa_strings_from_code('cocoa', 'cocoa/base/en.lproj')
+        loc.generate_cocoa_strings_from_code('cocoa', 'cocoa/en.lproj')
     print("Building .pot files from source files")
     print("Building core.pot")
     loc.generate_pot(['core'], op.join('locale', 'core.pot'), ['tr'])
@@ -232,7 +228,7 @@ def build_updatepot():
         loc.strings2pot(op.join('cocoalib', 'en.lproj', 'cocoalib.strings'), cocoalib_pot)
         print("Enhancing ui.pot with Cocoa's strings files")
         loc.strings2pot(
-            op.join('cocoa', 'base', 'en.lproj', 'Localizable.strings'),
+            op.join('cocoa', 'en.lproj', 'Localizable.strings'),
             op.join('locale', 'ui.pot')
         )
 
diff --git a/cocoa/base/AppDelegateBase.h b/cocoa/AppDelegate.h
similarity index 88%
rename from cocoa/base/AppDelegateBase.h
rename to cocoa/AppDelegate.h
index 038123f9..43df44c8 100644
--- a/cocoa/base/AppDelegateBase.h
+++ b/cocoa/AppDelegate.h
@@ -14,11 +14,13 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #import "DetailsPanel.h"
 #import "DirectoryPanel.h"
 #import "IgnoreListDialog.h"
+#import "ProblemDialog.h"
+#import "DeletionOptions.h"
 #import "HSAboutBox.h"
 #import "HSRecentFiles.h"
 #import "HSProgressWindow.h"
 
-@interface AppDelegateBase : NSObject <NSFileManagerDelegate>
+@interface AppDelegate : NSObject <NSFileManagerDelegate>
 {
     NSMenu *recentResultsMenu;
     NSMenu *columnsMenu;
@@ -29,6 +31,8 @@ http://www.gnu.org/licenses/gpl-3.0.html
     DirectoryPanel *_directoryPanel;
     DetailsPanel *_detailsPanel;
     IgnoreListDialog *_ignoreListDialog;
+    ProblemDialog *_problemDialog;
+    DeletionOptions *_deletionOptions;
     HSProgressWindow *_progressWindow;
     NSWindowController *_preferencesPanel;
     HSAboutBox *_aboutBox;
@@ -43,9 +47,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 + (NSDictionary *)defaultPreferences;
 - (PyDupeGuru *)model;
 - (DetailsPanel *)createDetailsPanel;
-- (NSString *)homepageURL;
 - (void)setScanOptions;
-- (void)initResultColumns:(ResultTable *)aTable;
 
 /* Public */
 - (void)finalizeInit;
@@ -53,6 +55,8 @@ http://www.gnu.org/licenses/gpl-3.0.html
 - (DirectoryPanel *)directoryPanel;
 - (DetailsPanel *)detailsPanel;
 - (HSRecentFiles *)recentResults;
+- (NSInteger)getAppMode;
+- (void)setAppMode:(NSInteger)appMode;
 
 /* Delegate */
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification;
@@ -62,6 +66,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 - (void)recentFileClicked:(NSString *)path;
 
 /* Actions */
+- (void)clearPictureCache;
 - (void)loadResults;
 - (void)openWebsite;
 - (void)openHelp;
diff --git a/cocoa/base/AppDelegateBase.m b/cocoa/AppDelegate.m
similarity index 58%
rename from cocoa/base/AppDelegateBase.m
rename to cocoa/AppDelegate.m
index 46e7b04b..77fc6b68 100644
--- a/cocoa/base/AppDelegateBase.m
+++ b/cocoa/AppDelegate.m
@@ -6,16 +6,19 @@ which should be included with this package. The terms are also available at
 http://www.gnu.org/licenses/gpl-3.0.html
 */
 
-#import "AppDelegateBase.h"
+#import "AppDelegate.h"
 #import "ProgressController.h"
 #import "HSPyUtil.h"
 #import "Consts.h"
 #import "Dialogs.h"
 #import "Utils.h"
 #import "ValueTransformers.h"
-#import "PreferencesPanel_UI.h"
+#import "DetailsPanelPicture.h"
+#import "PreferencesPanelStandard_UI.h"
+#import "PreferencesPanelMusic_UI.h"
+#import "PreferencesPanelPicture_UI.h"
 
-@implementation AppDelegateBase
+@implementation AppDelegate
 
 @synthesize recentResultsMenu;
 @synthesize columnsMenu;
@@ -24,6 +27,21 @@ http://www.gnu.org/licenses/gpl-3.0.html
 + (NSDictionary *)defaultPreferences
 {
     NSMutableDictionary *d = [NSMutableDictionary dictionary];
+    [d setObject:i2n(1) forKey:@"scanTypeStandard"];
+    [d setObject:i2n(3) forKey:@"scanTypeMusic"];
+    [d setObject:i2n(0) forKey:@"scanTypePicture"];
+    [d setObject:i2n(95) forKey:@"minMatchPercentage"];
+    [d setObject:i2n(30) forKey:@"smallFileThreshold"];
+    [d setObject:b2n(YES) forKey:@"wordWeighting"];
+    [d setObject:b2n(NO) forKey:@"matchSimilarWords"];
+    [d setObject:b2n(YES) forKey:@"ignoreSmallFiles"];
+    [d setObject:b2n(NO) forKey:@"scanTagTrack"];
+    [d setObject:b2n(YES) forKey:@"scanTagArtist"];
+    [d setObject:b2n(YES) forKey:@"scanTagAlbum"];
+    [d setObject:b2n(YES) forKey:@"scanTagTitle"];
+    [d setObject:b2n(NO) forKey:@"scanTagGenre"];
+    [d setObject:b2n(NO) forKey:@"scanTagYear"];
+    [d setObject:b2n(NO) forKey:@"matchScaled"];
     [d setObject:i2n(1) forKey:@"recreatePathType"];
     [d setObject:i2n(11) forKey:TableFontSize];
     [d setObject:b2n(YES) forKey:@"mixFileKind"];
@@ -53,6 +71,20 @@ http://www.gnu.org/licenses/gpl-3.0.html
     model = [[PyDupeGuru alloc] init];
     [model bindCallback:createCallback(@"DupeGuruView", self)];
     [self setUpdater:[SUUpdater sharedUpdater]];
+    NSMutableIndexSet *contentsIndexes = [NSMutableIndexSet indexSet];
+    [contentsIndexes addIndex:1];
+    [contentsIndexes addIndex:2];
+    VTIsIntIn *vt = [[[VTIsIntIn alloc] initWithValues:contentsIndexes reverse:YES] autorelease];
+    [NSValueTransformer setValueTransformer:vt forName:@"vtScanTypeIsNotContent"];
+    NSMutableIndexSet *i = [NSMutableIndexSet indexSetWithIndex:0];
+    VTIsIntIn *vtScanTypeIsFuzzy = [[[VTIsIntIn alloc] initWithValues:i reverse:NO] autorelease];
+    [NSValueTransformer setValueTransformer:vtScanTypeIsFuzzy forName:@"vtScanTypeIsFuzzy"];
+    i = [NSMutableIndexSet indexSetWithIndex:4];
+    [i addIndex:5];
+    VTIsIntIn *vtScanTypeIsNotContent = [[[VTIsIntIn alloc] initWithValues:i reverse:YES] autorelease];
+    [NSValueTransformer setValueTransformer:vtScanTypeIsNotContent forName:@"vtScanTypeMusicIsNotContent"];
+    VTIsIntIn *vtScanTypeIsTag = [[[VTIsIntIn alloc] initWithValues:[NSIndexSet indexSetWithIndex:3] reverse:NO] autorelease];
+    [NSValueTransformer setValueTransformer:vtScanTypeIsTag forName:@"vtScanTypeIsTag"];
     return self;
 }
 
@@ -69,14 +101,17 @@ http://www.gnu.org/licenses/gpl-3.0.html
     }
     _recentResults = [[HSRecentFiles alloc] initWithName:@"recentResults" menu:recentResultsMenu];
     [_recentResults setDelegate:self];
-    _resultWindow = [[ResultWindow alloc] initWithParentApp:self];
     _directoryPanel = [[DirectoryPanel alloc] initWithParentApp:self];
-    _detailsPanel = [self createDetailsPanel];
     _ignoreListDialog = [[IgnoreListDialog alloc] initWithPyRef:[model ignoreListDialog]];
+    _problemDialog = [[ProblemDialog alloc] initWithPyRef:[model problemDialog]];
+    _deletionOptions = [[DeletionOptions alloc] initWithPyRef:[model deletionOptions]];
     _progressWindow = [[HSProgressWindow alloc] initWithPyRef:[[self model] progressWindow] view:nil];
     [_progressWindow setParentWindow:[_directoryPanel window]];
-    _aboutBox = nil; // Lazily loaded
-    _preferencesPanel = nil; // Lazily loaded
+     // Lazily loaded
+    _aboutBox = nil;
+    _preferencesPanel = nil;
+    _resultWindow = nil;
+    _detailsPanel = nil;
     [[[self directoryPanel] window] makeKeyAndOrderFront:self];
 }
 
@@ -89,20 +124,45 @@ http://www.gnu.org/licenses/gpl-3.0.html
 
 - (DetailsPanel *)createDetailsPanel
 {
-    return [[DetailsPanel alloc] initWithPyRef:[model detailsPanel]];
-}
-
-- (NSString *)homepageURL
-{
-    return @""; // must be overriden by all editions
+    NSInteger appMode = [self getAppMode];
+    if (appMode == AppModePicture) {
+        return [[DetailsPanelPicture alloc] initWithPyRef:[model detailsPanel]];
+    }
+    else {
+        return [[DetailsPanel alloc] initWithPyRef:[model detailsPanel]];
+    }
 }
 
 - (void)setScanOptions
 {
-}
-
-- (void)initResultColumns:(ResultTable *)aTable
-{
+    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
+    NSString *scanTypeOptionName;
+    NSInteger appMode = [self getAppMode];
+    if (appMode == AppModePicture) {
+        scanTypeOptionName = @"scanTypePicture";
+    }
+    else if (appMode == AppModeMusic) {
+        scanTypeOptionName = @"scanTypeMusic";
+    }
+    else {
+        scanTypeOptionName = @"scanTypeStandard";
+    }
+    [model setScanType:n2i([ud objectForKey:scanTypeOptionName])];
+    [model setMinMatchPercentage:n2i([ud objectForKey:@"minMatchPercentage"])];
+    [model setWordWeighting:n2b([ud objectForKey:@"wordWeighting"])];
+    [model setMixFileKind:n2b([ud objectForKey:@"mixFileKind"])];
+    [model setIgnoreHardlinkMatches:n2b([ud objectForKey:@"ignoreHardlinkMatches"])];
+    [model setMatchSimilarWords:n2b([ud objectForKey:@"matchSimilarWords"])];
+    int smallFileThreshold = [ud integerForKey:@"smallFileThreshold"]; // In KB
+    int sizeThreshold = [ud boolForKey:@"ignoreSmallFiles"] ? smallFileThreshold * 1024 : 0; // The py side wants bytes
+    [model setSizeThreshold:sizeThreshold];
+    [model enable:n2b([ud objectForKey:@"scanTagTrack"]) scanForTag:@"track"];
+    [model enable:n2b([ud objectForKey:@"scanTagArtist"]) scanForTag:@"artist"];
+    [model enable:n2b([ud objectForKey:@"scanTagAlbum"]) scanForTag:@"album"];
+    [model enable:n2b([ud objectForKey:@"scanTagTitle"]) scanForTag:@"title"];
+    [model enable:n2b([ud objectForKey:@"scanTagGenre"]) scanForTag:@"genre"];
+    [model enable:n2b([ud objectForKey:@"scanTagYear"]) scanForTag:@"year"];
+    [model setMatchScaled:n2b([ud objectForKey:@"matchScaled"])];
 }
 
 /* Public */
@@ -126,7 +186,29 @@ http://www.gnu.org/licenses/gpl-3.0.html
     return _recentResults;
 }
 
+- (NSInteger)getAppMode
+{
+    return [model getAppMode];
+}
+
+- (void)setAppMode:(NSInteger)appMode
+{
+    [model setAppMode:appMode];
+    if (_preferencesPanel != nil) {
+        [_preferencesPanel release];
+        _preferencesPanel = nil;
+    }
+}
+
 /* Actions */
+- (void)clearPictureCache
+{
+    NSString *msg = NSLocalizedString(@"Do you really want to remove all your cached picture analysis?", @"");
+    if ([Dialogs askYesNo:msg] == NSAlertSecondButtonReturn) // NO
+        return;
+    [model clearPictureCache];
+}
+
 - (void)loadResults
 {
     NSOpenPanel *op = [NSOpenPanel openPanel];
@@ -145,7 +227,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 
 - (void)openWebsite
 {
-    [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:[self homepageURL]]];
+    [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://www.hardcoded.net/dupeguru/"]];
 }
 
 - (void)openHelp
@@ -172,7 +254,18 @@ http://www.gnu.org/licenses/gpl-3.0.html
 - (void)showPreferencesPanel
 {
     if (_preferencesPanel == nil) {
-        _preferencesPanel = [[NSWindowController alloc] initWithWindow:createPreferencesPanel_UI(nil)];
+        NSWindow *window;
+        NSInteger appMode = [model getAppMode];
+        if (appMode == AppModePicture) {
+            window = createPreferencesPanelPicture_UI(nil);
+        }
+        else if (appMode == AppModeMusic) {
+            window = createPreferencesPanelMusic_UI(nil);
+        }
+        else {
+            window = createPreferencesPanelStandard_UI(nil);
+        }
+        _preferencesPanel = [[NSWindowController alloc] initWithWindow:window];
     }
     [_preferencesPanel showWindow:nil];
 }
@@ -252,6 +345,17 @@ http://www.gnu.org/licenses/gpl-3.0.html
     return [Dialogs askYesNo:prompt] == NSAlertFirstButtonReturn;
 }
 
+- (void)createResultsWindow
+{
+    if (_resultWindow != nil) {
+        [_resultWindow release];
+    }
+    if (_detailsPanel != nil) {
+        [_detailsPanel release];
+    }
+    _resultWindow = [[ResultWindow alloc] initWithParentApp:self];
+    _detailsPanel = [self createDetailsPanel];
+}
 - (void)showResultsWindow
 {
     [[[self resultWindow] window] makeKeyAndOrderFront:nil];
@@ -259,7 +363,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 
 - (void)showProblemDialog
 {
-    [[self resultWindow] showProblemDialog];
+    [_problemDialog showWindow:self];
 }
 
 - (NSString *)selectDestFolderWithPrompt:(NSString *)prompt
diff --git a/cocoa/base/Consts.h b/cocoa/Consts.h
similarity index 82%
rename from cocoa/base/Consts.h
rename to cocoa/Consts.h
index ef1c504f..ff0c54fc 100644
--- a/cocoa/base/Consts.h
+++ b/cocoa/Consts.h
@@ -17,3 +17,8 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #define jobDelete @"job_delete"
 
 #define DGPrioritizeIndexPasteboardType @"DGPrioritizeIndexPasteboardType"
+#define ImageLoadedNotification @"ImageLoadedNotification"
+
+#define AppModeStandard 0
+#define AppModeMusic 1
+#define AppModePicture 2
\ No newline at end of file
diff --git a/cocoa/base/DeletionOptions.h b/cocoa/DeletionOptions.h
similarity index 100%
rename from cocoa/base/DeletionOptions.h
rename to cocoa/DeletionOptions.h
diff --git a/cocoa/base/DeletionOptions.m b/cocoa/DeletionOptions.m
similarity index 100%
rename from cocoa/base/DeletionOptions.m
rename to cocoa/DeletionOptions.m
diff --git a/cocoa/base/DetailsPanelBase.h b/cocoa/DetailsPanel.h
similarity index 90%
rename from cocoa/base/DetailsPanelBase.h
rename to cocoa/DetailsPanel.h
index 8ed6cc65..1c11f728 100644
--- a/cocoa/base/DetailsPanelBase.h
+++ b/cocoa/DetailsPanel.h
@@ -10,7 +10,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #import <Python.h>
 #import "PyDetailsPanel.h"
 
-@interface DetailsPanelBase : NSWindowController <NSTableViewDataSource>
+@interface DetailsPanel : NSWindowController <NSTableViewDataSource>
 {
     NSTableView *detailsTable;
     
diff --git a/cocoa/base/DetailsPanelBase.m b/cocoa/DetailsPanel.m
similarity index 92%
rename from cocoa/base/DetailsPanelBase.m
rename to cocoa/DetailsPanel.m
index 0f2c9d19..2efc7796 100644
--- a/cocoa/base/DetailsPanelBase.m
+++ b/cocoa/DetailsPanel.m
@@ -6,10 +6,11 @@ which should be included with this package. The terms are also available at
 http://www.gnu.org/licenses/gpl-3.0.html
 */
 
-#import "DetailsPanelBase.h"
+#import "DetailsPanel.h"
 #import "HSPyUtil.h"
+#import "DetailsPanel_UI.h"
 
-@implementation DetailsPanelBase
+@implementation DetailsPanel
 
 @synthesize detailsTable;
 
@@ -35,7 +36,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 
 - (NSWindow *)createWindow
 {
-    return nil; // Virtual
+    return createDetailsPanel_UI(self);
 }
 
 - (void)refreshDetails
diff --git a/cocoa/pe/DetailsPanel.h b/cocoa/DetailsPanelPicture.h
similarity index 92%
rename from cocoa/pe/DetailsPanel.h
rename to cocoa/DetailsPanelPicture.h
index 67d9b709..ff6b70d7 100644
--- a/cocoa/pe/DetailsPanel.h
+++ b/cocoa/DetailsPanelPicture.h
@@ -7,10 +7,10 @@ http://www.gnu.org/licenses/gpl-3.0.html
 */
 
 #import <Cocoa/Cocoa.h>
-#import "DetailsPanelBase.h"
+#import "DetailsPanel.h"
 #import "PyDupeGuru.h"
 
-@interface DetailsPanel : DetailsPanelBase
+@interface DetailsPanelPicture : DetailsPanel
 {
     NSImageView *dupeImage;
     NSProgressIndicator *dupeProgressIndicator;
diff --git a/cocoa/pe/DetailsPanel.m b/cocoa/DetailsPanelPicture.m
similarity index 94%
rename from cocoa/pe/DetailsPanel.m
rename to cocoa/DetailsPanelPicture.m
index dfaa60df..c8287a6a 100644
--- a/cocoa/pe/DetailsPanel.m
+++ b/cocoa/DetailsPanelPicture.m
@@ -10,11 +10,11 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #import "NSNotificationAdditions.h"
 #import "NSImageAdditions.h"
 #import "PyDupeGuru.h"
-#import "DetailsPanel.h"
+#import "DetailsPanelPicture.h"
 #import "Consts.h"
-#import "DetailsPanel_UI.h"
+#import "DetailsPanelPicture_UI.h"
 
-@implementation DetailsPanel
+@implementation DetailsPanelPicture
 
 @synthesize dupeImage;
 @synthesize dupeProgressIndicator;
@@ -32,7 +32,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 
 - (NSWindow *)createWindow
 {
-    return createDetailsPanel_UI(self);
+    return createDetailsPanelPicture_UI(self);
 }
 
 - (void)loadImageAsync:(NSString *)imagePath
diff --git a/cocoa/base/DirectoryOutline.h b/cocoa/DirectoryOutline.h
similarity index 100%
rename from cocoa/base/DirectoryOutline.h
rename to cocoa/DirectoryOutline.h
diff --git a/cocoa/base/DirectoryOutline.m b/cocoa/DirectoryOutline.m
similarity index 100%
rename from cocoa/base/DirectoryOutline.m
rename to cocoa/DirectoryOutline.m
diff --git a/cocoa/base/DirectoryPanel.h b/cocoa/DirectoryPanel.h
similarity index 85%
rename from cocoa/base/DirectoryPanel.h
rename to cocoa/DirectoryPanel.h
index 19318e42..b475f2a1 100644
--- a/cocoa/base/DirectoryPanel.h
+++ b/cocoa/DirectoryPanel.h
@@ -12,15 +12,16 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #import "DirectoryOutline.h"
 #import "PyDupeGuru.h"
 
-@class AppDelegateBase;
+@class AppDelegate;
 
 @interface DirectoryPanel : NSWindowController <NSOpenSavePanelDelegate>
 {
-    AppDelegateBase *_app;
+    AppDelegate *_app;
     PyDupeGuru *model;
     HSRecentFiles *_recentDirectories;
     DirectoryOutline *outline;
     BOOL _alwaysShowPopUp;
+    NSSegmentedControl *appModeSelector;
     NSPopUpButton *scanTypePopup;
     NSPopUpButton *addButtonPopUp;
     NSPopUpButton *loadRecentButtonPopUp;
@@ -29,6 +30,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
     NSButton *loadResultsButton;
 }
 
+@property (readwrite, retain) NSSegmentedControl *appModeSelector;
 @property (readwrite, retain) NSPopUpButton *scanTypePopup;
 @property (readwrite, retain) NSPopUpButton *addButtonPopUp;
 @property (readwrite, retain) NSPopUpButton *loadRecentButtonPopUp;
@@ -36,9 +38,10 @@ http://www.gnu.org/licenses/gpl-3.0.html
 @property (readwrite, retain) NSButton *removeButton;
 @property (readwrite, retain) NSButton *loadResultsButton;
 
-- (id)initWithParentApp:(AppDelegateBase *)aParentApp;
+- (id)initWithParentApp:(AppDelegate *)aParentApp;
 
-- (void)fillPopUpMenu; // Virtual
+- (void)fillPopUpMenu;
+- (void)fillScanTypeMenu;
 - (void)adjustUIToLocalization;
 
 - (void)askForDirectory;
diff --git a/cocoa/base/DirectoryPanel.m b/cocoa/DirectoryPanel.m
similarity index 84%
rename from cocoa/base/DirectoryPanel.m
rename to cocoa/DirectoryPanel.m
index e3b10daa..731b11b5 100644
--- a/cocoa/base/DirectoryPanel.m
+++ b/cocoa/DirectoryPanel.m
@@ -11,9 +11,11 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #import "Dialogs.h"
 #import "Utils.h"
 #import "AppDelegate.h"
+#import "Consts.h"
 
 @implementation DirectoryPanel
 
+@synthesize appModeSelector;
 @synthesize scanTypePopup;
 @synthesize addButtonPopUp;
 @synthesize loadRecentButtonPopUp;
@@ -21,15 +23,15 @@ http://www.gnu.org/licenses/gpl-3.0.html
 @synthesize removeButton;
 @synthesize loadResultsButton;
 
-- (id)initWithParentApp:(AppDelegateBase *)aParentApp
+- (id)initWithParentApp:(AppDelegate *)aParentApp
 {
     self = [super initWithWindow:nil];
     [self setWindow:createDirectoryPanel_UI(self)];
     _app = aParentApp;
     model = [_app model];
     [[self window] setTitle:[model appName]];
-    [[self scanTypePopup] addItemsWithTitles:[[aParentApp model] getScanOptions]];
-    [[self scanTypePopup] bind:@"selectedIndex" toObject:[NSUserDefaultsController sharedUserDefaultsController] withKeyPath:@"values.scanType" options:nil];
+    self.appModeSelector.selectedSegment = 0;
+    [self fillScanTypeMenu];
     _alwaysShowPopUp = NO;
     [self fillPopUpMenu];
     _recentDirectories = [[HSRecentFiles alloc] initWithName:@"recentDirectories" menu:[addButtonPopUp menu]];
@@ -62,6 +64,25 @@ http://www.gnu.org/licenses/gpl-3.0.html
     [m addItem:[NSMenuItem separatorItem]];
 }
 
+- (void)fillScanTypeMenu
+{
+    [[self scanTypePopup] unbind:@"selectedIndex"];
+    [[self scanTypePopup] removeAllItems];
+    [[self scanTypePopup] addItemsWithTitles:[[_app model] getScanOptions]];
+    NSString *keypath;
+    NSInteger appMode = [_app getAppMode];
+    if (appMode == AppModePicture) {
+        keypath = @"values.scanTypePicture";
+    }
+    else if (appMode == AppModeMusic) {
+        keypath = @"values.scanTypeMusic";
+    }
+    else {
+        keypath = @"values.scanTypeStandard";
+    }
+    [[self scanTypePopup] bind:@"selectedIndex" toObject:[NSUserDefaultsController sharedUserDefaultsController] withKeyPath:keypath options:nil];
+}
+
 - (void)adjustUIToLocalization
 {
     NSString *lang = [[NSBundle preferredLocalizationsFromArray:[[NSBundle mainBundle] localizations]] objectAtIndex:0];
@@ -100,6 +121,23 @@ http://www.gnu.org/licenses/gpl-3.0.html
     }
 }
 
+- (void)changeAppMode:(id)sender
+{
+    NSInteger appMode;
+    NSUInteger selectedSegment = self.appModeSelector.selectedSegment;
+    if (selectedSegment == 2) {
+        appMode = AppModePicture;
+    }
+    else if (selectedSegment == 1) {
+        appMode = AppModeMusic;
+    }
+    else {
+        appMode = AppModeStandard;
+    }
+    [_app setAppMode:appMode];
+    [self fillScanTypeMenu];
+}
+
 - (void)popupAddDirectoryMenu:(id)sender
 {
     if ((!_alwaysShowPopUp) && ([[_recentDirectories filepaths] count] == 0)) {
diff --git a/cocoa/base/IgnoreListDialog.h b/cocoa/IgnoreListDialog.h
similarity index 100%
rename from cocoa/base/IgnoreListDialog.h
rename to cocoa/IgnoreListDialog.h
diff --git a/cocoa/base/IgnoreListDialog.m b/cocoa/IgnoreListDialog.m
similarity index 100%
rename from cocoa/base/IgnoreListDialog.m
rename to cocoa/IgnoreListDialog.m
diff --git a/cocoa/se/InfoTemplate.plist b/cocoa/InfoTemplate.plist
similarity index 100%
rename from cocoa/se/InfoTemplate.plist
rename to cocoa/InfoTemplate.plist
diff --git a/cocoa/base/PrioritizeDialog.h b/cocoa/PrioritizeDialog.h
similarity index 100%
rename from cocoa/base/PrioritizeDialog.h
rename to cocoa/PrioritizeDialog.h
diff --git a/cocoa/base/PrioritizeDialog.m b/cocoa/PrioritizeDialog.m
similarity index 100%
rename from cocoa/base/PrioritizeDialog.m
rename to cocoa/PrioritizeDialog.m
diff --git a/cocoa/base/PrioritizeList.h b/cocoa/PrioritizeList.h
similarity index 100%
rename from cocoa/base/PrioritizeList.h
rename to cocoa/PrioritizeList.h
diff --git a/cocoa/base/PrioritizeList.m b/cocoa/PrioritizeList.m
similarity index 100%
rename from cocoa/base/PrioritizeList.m
rename to cocoa/PrioritizeList.m
diff --git a/cocoa/base/ProblemDialog.h b/cocoa/ProblemDialog.h
similarity index 100%
rename from cocoa/base/ProblemDialog.h
rename to cocoa/ProblemDialog.h
diff --git a/cocoa/base/ProblemDialog.m b/cocoa/ProblemDialog.m
similarity index 100%
rename from cocoa/base/ProblemDialog.m
rename to cocoa/ProblemDialog.m
diff --git a/cocoa/base/ResultTable.h b/cocoa/ResultTable.h
similarity index 100%
rename from cocoa/base/ResultTable.h
rename to cocoa/ResultTable.h
diff --git a/cocoa/base/ResultTable.m b/cocoa/ResultTable.m
similarity index 100%
rename from cocoa/base/ResultTable.m
rename to cocoa/ResultTable.m
diff --git a/cocoa/base/ResultWindow.h b/cocoa/ResultWindow.h
similarity index 87%
rename from cocoa/base/ResultWindow.h
rename to cocoa/ResultWindow.h
index d61ab430..509b042b 100644
--- a/cocoa/base/ResultWindow.h
+++ b/cocoa/ResultWindow.h
@@ -10,12 +10,10 @@ http://www.gnu.org/licenses/gpl-3.0.html
 #import <Quartz/Quartz.h>
 #import "StatsLabel.h"
 #import "ResultTable.h"
-#import "ProblemDialog.h"
-#import "DeletionOptions.h"
 #import "HSTableView.h"
 #import "PyDupeGuru.h"
 
-@class AppDelegateBase;
+@class AppDelegate;
 
 @interface ResultWindow : NSWindowController
 {
@@ -26,12 +24,10 @@ http://www.gnu.org/licenses/gpl-3.0.html
     NSTextField *stats;
     NSSearchField *filterField;
     
-    AppDelegateBase *app;
+    AppDelegate *app;
     PyDupeGuru *model;
     ResultTable *table;
     StatsLabel *statsLabel;
-    ProblemDialog *problemDialog;
-    DeletionOptions *deletionOptions;
     QLPreviewPanel* previewPanel;
 }
 
@@ -41,13 +37,13 @@ http://www.gnu.org/licenses/gpl-3.0.html
 @property (readwrite, retain) NSTextField *stats;
 @property (readwrite, retain) NSSearchField *filterField;
 
-- (id)initWithParentApp:(AppDelegateBase *)app;
+- (id)initWithParentApp:(AppDelegate *)app;
 
 /* Helpers */
 - (void)fillColumnsMenu;
 - (void)updateOptionSegments;
-- (void)showProblemDialog;
 - (void)adjustUIToLocalization;
+- (void)initResultColumns:(ResultTable *)aTable;
 
 /* Actions */
 - (void)changeOptions;
diff --git a/cocoa/base/ResultWindow.m b/cocoa/ResultWindow.m
similarity index 69%
rename from cocoa/base/ResultWindow.m
rename to cocoa/ResultWindow.m
index 9afc6723..f0cc860e 100644
--- a/cocoa/base/ResultWindow.m
+++ b/cocoa/ResultWindow.m
@@ -23,7 +23,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
 @synthesize stats;
 @synthesize filterField;
 
-- (id)initWithParentApp:(AppDelegateBase *)aApp;
+- (id)initWithParentApp:(AppDelegate *)aApp;
 {
     self = [super initWithWindow:nil];
     app = aApp;
@@ -34,9 +34,7 @@ http://www.gnu.org/licenses/gpl-3.0.html
     [[self window] setContentBorderThickness:28 forEdge:NSMinYEdge];
     table = [[ResultTable alloc] initWithPyRef:[model resultTable] view:matches];
     statsLabel = [[StatsLabel alloc] initWithPyRef:[model statsLabel] view:stats];
-    problemDialog = [[ProblemDialog alloc] initWithPyRef:[model problemDialog]];
-    deletionOptions = [[DeletionOptions alloc] initWithPyRef:[model deletionOptions]];
-    [aApp initResultColumns:table];
+    [self initResultColumns:table];
     [[table columns] setColumnsAsReadOnly];
     [self fillColumnsMenu];
     [matches setTarget:self];
@@ -49,7 +47,6 @@ http://www.gnu.org/licenses/gpl-3.0.html
 {
     [table release];
     [statsLabel release];
-    [problemDialog release];
     [super dealloc];
 }
 
@@ -80,11 +77,6 @@ http://www.gnu.org/licenses/gpl-3.0.html
     [optionsSwitch setSelected:[table deltaValuesMode] forSegment:2];
 }
 
-- (void)showProblemDialog
-{
-    [problemDialog showWindow:self];
-}
-
 - (void)adjustUIToLocalization
 {
     NSString *lang = [[NSBundle preferredLocalizationsFromArray:[[NSBundle mainBundle] localizations]] objectAtIndex:0];
@@ -109,6 +101,87 @@ http://www.gnu.org/licenses/gpl-3.0.html
     }
 }
 
+- (void)initResultColumns:(ResultTable *)aTable
+{
+    NSInteger appMode = [app getAppMode];
+    if (appMode == AppModePicture) {
+        HSColumnDef defs[] = {
+            {@"marked", 26, 26, 26, YES, [NSButtonCell class]},
+            {@"name", 162, 16, 0, YES, nil},
+            {@"folder_path", 142, 16, 0, YES, nil},
+            {@"size", 63, 16, 0, YES, nil},
+            {@"extension", 40, 16, 0, YES, nil},
+            {@"dimensions", 73, 16, 0, YES, nil},
+            {@"exif_timestamp", 120, 16, 0, YES, nil},
+            {@"mtime", 120, 16, 0, YES, nil},
+            {@"percentage", 58, 16, 0, YES, nil},
+            {@"dupe_count", 80, 16, 0, YES, nil},
+            nil
+        };
+        [[aTable columns] initializeColumns:defs];
+        NSTableColumn *c = [[aTable view] tableColumnWithIdentifier:@"marked"];
+        [[c dataCell] setButtonType:NSSwitchButton];
+        [[c dataCell] setControlSize:NSSmallControlSize];
+        c = [[aTable view] tableColumnWithIdentifier:@"size"];
+        [[c dataCell] setAlignment:NSRightTextAlignment];
+    }
+    else if (appMode == AppModeMusic) {
+        HSColumnDef defs[] = {
+            {@"marked", 26, 26, 26, YES, [NSButtonCell class]},
+            {@"name", 235, 16, 0, YES, nil},
+            {@"folder_path", 120, 16, 0, YES, nil},
+            {@"size", 63, 16, 0, YES, nil},
+            {@"duration", 50, 16, 0, YES, nil},
+            {@"bitrate", 50, 16, 0, YES, nil},
+            {@"samplerate", 60, 16, 0, YES, nil},
+            {@"extension", 40, 16, 0, YES, nil},
+            {@"mtime", 120, 16, 0, YES, nil},
+            {@"title", 120, 16, 0, YES, nil},
+            {@"artist", 120, 16, 0, YES, nil},
+            {@"album", 120, 16, 0, YES, nil},
+            {@"genre", 80, 16, 0, YES, nil},
+            {@"year", 40, 16, 0, YES, nil},
+            {@"track", 40, 16, 0, YES, nil},
+            {@"comment", 120, 16, 0, YES, nil},
+            {@"percentage", 57, 16, 0, YES, nil},
+            {@"words", 120, 16, 0, YES, nil},
+            {@"dupe_count", 80, 16, 0, YES, nil},
+            nil
+        };
+        [[aTable columns] initializeColumns:defs];
+        NSTableColumn *c = [[aTable view] tableColumnWithIdentifier:@"marked"];
+        [[c dataCell] setButtonType:NSSwitchButton];
+        [[c dataCell] setControlSize:NSSmallControlSize];
+        c = [[aTable view] tableColumnWithIdentifier:@"size"];
+        [[c dataCell] setAlignment:NSRightTextAlignment];
+        c = [[aTable view] tableColumnWithIdentifier:@"duration"];
+        [[c dataCell] setAlignment:NSRightTextAlignment];
+        c = [[aTable view] tableColumnWithIdentifier:@"bitrate"];
+        [[c dataCell] setAlignment:NSRightTextAlignment];
+    }
+    else {
+        HSColumnDef defs[] = {
+            {@"marked", 26, 26, 26, YES, [NSButtonCell class]},
+            {@"name", 195, 16, 0, YES, nil},
+            {@"folder_path", 183, 16, 0, YES, nil},
+            {@"size", 63, 16, 0, YES, nil},
+            {@"extension", 40, 16, 0, YES, nil},
+            {@"mtime", 120, 16, 0, YES, nil},
+            {@"percentage", 60, 16, 0, YES, nil},
+            {@"words", 120, 16, 0, YES, nil},
+            {@"dupe_count", 80, 16, 0, YES, nil},
+            nil
+        };
+        [[aTable columns] initializeColumns:defs];
+        NSTableColumn *c = [[aTable view] tableColumnWithIdentifier:@"marked"];
+        [[c dataCell] setButtonType:NSSwitchButton];
+        [[c dataCell] setControlSize:NSSmallControlSize];
+        c = [[aTable view] tableColumnWithIdentifier:@"size"];
+        [[c dataCell] setAlignment:NSRightTextAlignment];
+    }
+    [[aTable columns] restoreColumns];
+}
+
 /* Actions */
 - (void)changeOptions
 {
diff --git a/cocoa/base/StatsLabel.h b/cocoa/StatsLabel.h
similarity index 100%
rename from cocoa/base/StatsLabel.h
rename to cocoa/StatsLabel.h
diff --git a/cocoa/base/StatsLabel.m b/cocoa/StatsLabel.m
similarity index 100%
rename from cocoa/base/StatsLabel.m
rename to cocoa/StatsLabel.m
diff --git a/cocoa/se/dg_cocoa.py b/cocoa/dg_cocoa.py
similarity index 100%
rename from cocoa/se/dg_cocoa.py
rename to cocoa/dg_cocoa.py
diff --git a/cocoa/base/dsa_pub.pem b/cocoa/dsa_pub.pem
similarity index 100%
rename from cocoa/base/dsa_pub.pem
rename to cocoa/dsa_pub.pem
diff --git a/cocoa/se/dupeguru.icns b/cocoa/dupeguru.icns
similarity index 100%
rename from cocoa/se/dupeguru.icns
rename to cocoa/dupeguru.icns
diff --git a/cocoa/base/en.lproj/Localizable.strings b/cocoa/en.lproj/Localizable.strings
similarity index 100%
rename from cocoa/base/en.lproj/Localizable.strings
rename to cocoa/en.lproj/Localizable.strings
diff --git a/cocoa/inter/app.py b/cocoa/inter/app.py
index 91da591a..2efd47c9 100644
--- a/cocoa/inter/app.py
+++ b/cocoa/inter/app.py
@@ -6,6 +6,7 @@ from cocoa.inter import PyBaseApp, BaseAppView
 
 class DupeGuruView(BaseAppView):
     def askYesNoWithPrompt_(self, prompt: str) -> bool: pass
+    def createResultsWindow(self): pass
     def showResultsWindow(self): pass
     def showProblemDialog(self): pass
     def selectDestFolderWithPrompt_(self, prompt: str) -> str: pass
@@ -123,6 +124,9 @@ class PyDupeGuruBase(PyBaseApp):
     def showIgnoreList(self):
         self.model.ignore_list_dialog.show()
     
+    def clearPictureCache(self):
+        self.model.clear_picture_cache()
+    
     #---Information
     def getScanOptions(self) -> list:
         return [o.label for o in self.model.SCANNER_CLASS.get_scan_options()]
@@ -130,7 +134,50 @@ class PyDupeGuruBase(PyBaseApp):
     def resultsAreModified(self) -> bool:
         return self.model.results.is_modified
     
+    def getSelectedDupePath(self) -> str:
+        return str(self.model.selected_dupe_path())
+    
+    def getSelectedDupeRefPath(self) -> str:
+        return str(self.model.selected_dupe_ref_path())
+    
     #---Properties
+    def getAppMode(self) -> int:
+        return self.model.app_mode
+
+    def setAppMode_(self, app_mode: int):
+        self.model.app_mode = app_mode
+    
+    def setScanType_(self, scan_type_index: int):
+        scan_options = self.model.SCANNER_CLASS.get_scan_options()
+        try:
+            so = scan_options[scan_type_index]
+            self.model.options['scan_type'] = so.scan_type
+        except IndexError:
+            pass
+
+    def setMinMatchPercentage_(self, percentage: int):
+        self.model.options['min_match_percentage'] = int(percentage)
+    
+    def setWordWeighting_(self, words_are_weighted: bool):
+        self.model.options['word_weighting'] = words_are_weighted
+    
+    def setMatchSimilarWords_(self, match_similar_words: bool):
+        self.model.options['match_similar_words'] = match_similar_words
+    
+    def setSizeThreshold_(self, size_threshold: int):
+        self.model.options['size_threshold'] = size_threshold
+
+    def enable_scanForTag_(self, enable: bool, scan_tag: str):
+        if 'scanned_tags' not in self.model.options:
+            self.model.options['scanned_tags'] = set()
+        if enable:
+            self.model.options['scanned_tags'].add(scan_tag)
+        else:
+            self.model.options['scanned_tags'].discard(scan_tag)
+
+    def setMatchScaled_(self, match_scaled: bool):
+        self.model.options['match_scaled'] = match_scaled
+    
     def setMixFileKind_(self, mix_file_kind: bool):
         self.model.options['mix_file_kind'] = mix_file_kind
     
@@ -151,6 +198,10 @@ class PyDupeGuruBase(PyBaseApp):
     def ask_yes_no(self, prompt):
         return self.callback.askYesNoWithPrompt_(prompt)
     
+    @dontwrap
+    def create_results_window(self):
+        self.callback.createResultsWindow()
+    
     @dontwrap
     def show_results_window(self):
         self.callback.showResultsWindow()
diff --git a/cocoa/inter/app_me.py b/cocoa/inter/app_me.py
deleted file mode 100644
index 70e20b3f..00000000
--- a/cocoa/inter/app_me.py
+++ /dev/null
@@ -1,48 +0,0 @@
-# Copyright 2016 Hardcoded Software (http://www.hardcoded.net)
-# 
-# This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-# which should be included with this package. The terms are also available at 
-# http://www.gnu.org/licenses/gpl-3.0.html
-
-from hscommon.trans import trget
-
-from core.scanner import ScanType
-from core_me.app import DupeGuru as DupeGuruME
-from .app import PyDupeGuruBase
-
-tr = trget('ui')
-
-class PyDupeGuru(PyDupeGuruBase):
-    def __init__(self):
-        self._init(DupeGuruME)
-    
-    #---Properties
-    def setMinMatchPercentage_(self, percentage: int):
-        self.model.options['min_match_percentage'] = percentage
-    
-    def setScanType_(self, scan_type: int):
-        try:
-            self.model.options['scan_type'] = [
-                ScanType.Filename,
-                ScanType.Fields,
-                ScanType.FieldsNoOrder,
-                ScanType.Tag,
-                ScanType.Contents,
-                ScanType.ContentsAudio,
-            ][scan_type]
-        except IndexError:
-            pass
-    
-    def setWordWeighting_(self, words_are_weighted: bool):
-        self.model.options['word_weighting'] = words_are_weighted
-    
-    def setMatchSimilarWords_(self, match_similar_words: bool):
-        self.model.options['match_similar_words'] = match_similar_words
-    
-    def enable_scanForTag_(self, enable: bool, scan_tag: str):
-        if 'scanned_tags' not in self.model.options:
-            self.model.options['scanned_tags'] = set()
-        if enable:
-            self.model.options['scanned_tags'].add(scan_tag)
-        else:
-            self.model.options['scanned_tags'].discard(scan_tag)
diff --git a/cocoa/inter/app_pe.py b/cocoa/inter/app_pe.py
deleted file mode 100644
index 06988277..00000000
--- a/cocoa/inter/app_pe.py
+++ /dev/null
@@ -1,90 +0,0 @@
-# Copyright 2016 Hardcoded Software (http://www.hardcoded.net)
-# 
-# This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-# which should be included with this package. The terms are also available at 
-# http://www.gnu.org/licenses/gpl-3.0.html
-
-from cocoa import proxy
-
-from core.scanner import ScanType
-from core_pe import _block_osx
-from core_pe.photo import Photo as PhotoBase
-from core_pe.app import DupeGuru as DupeGuruBase
-from .app import PyDupeGuruBase
-
-
-class Photo(PhotoBase):
-    HANDLED_EXTS = PhotoBase.HANDLED_EXTS.copy()
-    HANDLED_EXTS.update({'psd', 'nef', 'cr2', 'orf'})
-    
-    def _plat_get_dimensions(self):
-        return _block_osx.get_image_size(str(self.path))
-    
-    def _plat_get_blocks(self, block_count_per_side, orientation):
-        try:
-            blocks = _block_osx.getblocks(str(self.path), block_count_per_side, orientation)
-        except Exception as e:
-            raise IOError('The reading of "%s" failed with "%s"' % (str(self.path), str(e)))
-        if not blocks:
-            raise IOError('The picture %s could not be read' % str(self.path))
-        return blocks
-    
-    def _get_exif_timestamp(self):
-        exifdata = proxy.readExifData_(str(self.path))
-        if exifdata:
-            try:
-                return exifdata['{Exif}']['DateTimeOriginal']
-            except KeyError:
-                return ''
-        else:
-            return ''
-
-
-class DupeGuruPE(DupeGuruBase):
-    def __init__(self, view):
-        DupeGuruBase.__init__(self, view)
-        self.fileclasses = [Photo]
-
-    def selected_dupe_path(self):
-        if not self.selected_dupes:
-            return None
-        return self.selected_dupes[0].path
-    
-    def selected_dupe_ref_path(self):
-        if not self.selected_dupes:
-            return None
-        ref = self.results.get_group_of_duplicate(self.selected_dupes[0]).ref
-        if ref is self.selected_dupes[0]: # we don't want the same pic to be displayed on both sides
-            return None
-        return ref.path
-
-
-class PyDupeGuru(PyDupeGuruBase):
-    def __init__(self):
-        self._init(DupeGuruPE)
-    
-    def clearPictureCache(self):
-        self.model.clear_picture_cache()
-    
-    #---Information    
-    def getSelectedDupePath(self) -> str:
-        return str(self.model.selected_dupe_path())
-    
-    def getSelectedDupeRefPath(self) -> str:
-        return str(self.model.selected_dupe_ref_path())
-    
-    #---Properties
-    def setScanType_(self, scan_type: int):
-        try:
-            self.model.options['scan_type'] = [
-                ScanType.FuzzyBlock,
-                ScanType.ExifTimestamp,
-            ][scan_type]
-        except IndexError:
-            pass
-    
-    def setMatchScaled_(self, match_scaled: bool):
-        self.model.options['match_scaled'] = match_scaled
-    
-    def setMinMatchPercentage_(self, percentage: int):
-        self.model.options['threshold'] = percentage
diff --git a/cocoa/inter/app_se.py b/cocoa/inter/app_se.py
index 4dcbf2a5..c4bd2385 100644
--- a/cocoa/inter/app_se.py
+++ b/cocoa/inter/app_se.py
@@ -12,10 +12,12 @@ import os.path as op
 from hscommon.path import Path, pathify
 from cocoa import proxy
 
-from core.scanner import ScanType
 from core.directories import Directories as DirectoriesBase, DirectoryState
-from core_se.app import DupeGuru as DupeGuruBase
-from core_se import fs
+import core.pe.photo
+from core.pe import _block_osx
+from core.pe.photo import Photo as PhotoBase
+from core.app import DupeGuru as DupeGuruBase, AppMode
+from core.se import fs
 from .app import PyDupeGuruBase
 
 def is_bundle(str_path):
@@ -31,13 +33,37 @@ class Bundle(fs.Folder):
         return not path.islink() and path.isdir() and is_bundle(str(path))
     
 
+class Photo(PhotoBase):
+    HANDLED_EXTS = PhotoBase.HANDLED_EXTS.copy()
+    HANDLED_EXTS.update({'psd', 'nef', 'cr2', 'orf'})
+    
+    def _plat_get_dimensions(self):
+        return _block_osx.get_image_size(str(self.path))
+    
+    def _plat_get_blocks(self, block_count_per_side, orientation):
+        try:
+            blocks = _block_osx.getblocks(str(self.path), block_count_per_side, orientation)
+        except Exception as e:
+            raise IOError('The reading of "%s" failed with "%s"' % (str(self.path), str(e)))
+        if not blocks:
+            raise IOError('The picture %s could not be read' % str(self.path))
+        return blocks
+    
+    def _get_exif_timestamp(self):
+        exifdata = proxy.readExifData_(str(self.path))
+        if exifdata:
+            try:
+                return exifdata['{Exif}']['DateTimeOriginal']
+            except KeyError:
+                return ''
+        else:
+            return ''
+
+
 class Directories(DirectoriesBase):
     ROOT_PATH_TO_EXCLUDE = list(map(Path, ['/Library', '/Volumes', '/System', '/bin', '/sbin', '/opt', '/private', '/dev']))
     HOME_PATH_TO_EXCLUDE = [Path('Library')]
-    def __init__(self):
-        DirectoriesBase.__init__(self)
-        self.folderclass = fs.Folder
-    
+
     def _default_state_for_path(self, path):
         result = DirectoriesBase._default_state_for_path(self, path)
         if result is not None:
@@ -58,8 +84,7 @@ class Directories(DirectoriesBase):
                 yield from_folder
             return
         else:
-            for folder in DirectoriesBase._get_folders(self, from_folder, j):
-                yield folder
+            yield from DirectoriesBase._get_folders(self, from_folder, j)
     
     @staticmethod
     def get_subfolders(path):
@@ -69,37 +94,31 @@ class Directories(DirectoriesBase):
 
 class DupeGuru(DupeGuruBase):
     def __init__(self, view):
-        # appdata = op.join(appdata, 'dupeGuru')
-        # print(repr(appdata))
         DupeGuruBase.__init__(self, view)
-        self.fileclasses = [Bundle, fs.File]
         self.directories = Directories()
     
+    def selected_dupe_path(self):
+        if not self.selected_dupes:
+            return None
+        return self.selected_dupes[0].path
+    
+    def selected_dupe_ref_path(self):
+        if not self.selected_dupes:
+            return None
+        ref = self.results.get_group_of_duplicate(self.selected_dupes[0]).ref
+        if ref is self.selected_dupes[0]: # we don't want the same pic to be displayed on both sides
+            return None
+        return ref.path
+    
+    def _get_fileclasses(self):
+        result = DupeGuruBase._get_fileclasses(self)
+        if self.app_mode == AppMode.Standard:
+            result = [Bundle] + result
+        return result
 
 class PyDupeGuru(PyDupeGuruBase):
     def __init__(self):
+        core.pe.photo.PLAT_SPECIFIC_PHOTO_CLASS = Photo
         self._init(DupeGuru)
-    
-    #---Properties
-    def setMinMatchPercentage_(self, percentage: int):
-        self.model.options['min_match_percentage'] = int(percentage)
-    
-    def setScanType_(self, scan_type: int):
-        try:
-            self.model.options['scan_type'] = [
-                ScanType.Filename,
-                ScanType.Contents,
-                ScanType.Folders,
-            ][scan_type]
-        except IndexError:
-            pass
-    
-    def setWordWeighting_(self, words_are_weighted: bool):
-        self.model.options['word_weighting'] = words_are_weighted
-    
-    def setMatchSimilarWords_(self, match_similar_words: bool):
-        self.model.options['match_similar_words'] = match_similar_words
-    
-    def setSizeThreshold_(self, size_threshold: int):
-        self.model.options['size_threshold'] = size_threshold
+
     
diff --git a/cocoa/base/main.m b/cocoa/main.m
similarity index 100%
rename from cocoa/base/main.m
rename to cocoa/main.m
diff --git a/cocoa/me/AppDelegate.h b/cocoa/me/AppDelegate.h
deleted file mode 100644
index 79cf3e41..00000000
--- a/cocoa/me/AppDelegate.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import <Cocoa/Cocoa.h>
-#import "AppDelegateBase.h"
-#import "ResultWindow.h"
-#import "PyDupeGuru.h"
-
-@interface AppDelegate : AppDelegateBase {}
-@end
diff --git a/cocoa/me/AppDelegate.m b/cocoa/me/AppDelegate.m
deleted file mode 100644
index 95f274da..00000000
--- a/cocoa/me/AppDelegate.m
+++ /dev/null
@@ -1,106 +0,0 @@
-/* 
-Copyright 2016 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import "AppDelegate.h"
-#import "ProgressController.h"
-#import "Utils.h"
-#import "ValueTransformers.h"
-#import "Dialogs.h"
-#import "DetailsPanel.h"
-#import "ResultWindow.h"
-#import "Consts.h"
-
-@implementation AppDelegate
-+ (NSDictionary *)defaultPreferences
-{
-    NSMutableDictionary *d = [NSMutableDictionary dictionaryWithDictionary:[super defaultPreferences]];
-    [d setObject:i2n(3) forKey:@"scanType"];
-    [d setObject:i2n(80) forKey:@"minMatchPercentage"];
-    [d setObject:b2n(NO) forKey:@"wordWeighting"];
-    [d setObject:b2n(NO) forKey:@"matchSimilarWords"];
-    [d setObject:b2n(NO) forKey:@"scanTagTrack"];
-    [d setObject:b2n(YES) forKey:@"scanTagArtist"];
-    [d setObject:b2n(YES) forKey:@"scanTagAlbum"];
-    [d setObject:b2n(YES) forKey:@"scanTagTitle"];
-    [d setObject:b2n(NO) forKey:@"scanTagGenre"];
-    [d setObject:b2n(NO) forKey:@"scanTagYear"];
-    return d;
-}
-
-- (id)init
-{
-    self = [super init];
-    NSMutableIndexSet *i = [NSMutableIndexSet indexSetWithIndex:4];
-    [i addIndex:5];
-    VTIsIntIn *vtScanTypeIsNotContent = [[[VTIsIntIn alloc] initWithValues:i reverse:YES] autorelease];
-    [NSValueTransformer setValueTransformer:vtScanTypeIsNotContent forName:@"vtScanTypeIsNotContent"];
-    VTIsIntIn *vtScanTypeIsTag = [[[VTIsIntIn alloc] initWithValues:[NSIndexSet indexSetWithIndex:3] reverse:NO] autorelease];
-    [NSValueTransformer setValueTransformer:vtScanTypeIsTag forName:@"vtScanTypeIsTag"];
-    _directoryPanel = nil;
-    return self;
-}
-
-- (NSString *)homepageURL
-{
-    return @"https://www.hardcoded.net/dupeguru_me/";
-}
-
-- (void)setScanOptions
-{
-    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
-    [model setScanType:n2i([ud objectForKey:@"scanType"])];
-    [model enable:n2b([ud objectForKey:@"scanTagTrack"]) scanForTag:@"track"];
-    [model enable:n2b([ud objectForKey:@"scanTagArtist"]) scanForTag:@"artist"];
-    [model enable:n2b([ud objectForKey:@"scanTagAlbum"]) scanForTag:@"album"];
-    [model enable:n2b([ud objectForKey:@"scanTagTitle"]) scanForTag:@"title"];
-    [model enable:n2b([ud objectForKey:@"scanTagGenre"]) scanForTag:@"genre"];
-    [model enable:n2b([ud objectForKey:@"scanTagYear"]) scanForTag:@"year"];
-    [model setMinMatchPercentage:n2i([ud objectForKey:@"minMatchPercentage"])];
-    [model setWordWeighting:n2b([ud objectForKey:@"wordWeighting"])];
-    [model setMixFileKind:n2b([ud objectForKey:@"mixFileKind"])];
-    [model setIgnoreHardlinkMatches:n2b([ud objectForKey:@"ignoreHardlinkMatches"])];
-    [model setMatchSimilarWords:n2b([ud objectForKey:@"matchSimilarWords"])];
-}
-
-- (void)initResultColumns:(ResultTable *)aTable
-{
-    HSColumnDef defs[] = {
-        {@"marked", 26, 26, 26, YES, [NSButtonCell class]},
-        {@"name", 235, 16, 0, YES, nil},
-        {@"folder_path", 120, 16, 0, YES, nil},
-        {@"size", 63, 16, 0, YES, nil},
-        {@"duration", 50, 16, 0, YES, nil},
-        {@"bitrate", 50, 16, 0, YES, nil},
-        {@"samplerate", 60, 16, 0, YES, nil},
-        {@"extension", 40, 16, 0, YES, nil},
-        {@"mtime", 120, 16, 0, YES, nil},
-        {@"title", 120, 16, 0, YES, nil},
-        {@"artist", 120, 16, 0, YES, nil},
-        {@"album", 120, 16, 0, YES, nil},
-        {@"genre", 80, 16, 0, YES, nil},
-        {@"year", 40, 16, 0, YES, nil},
-        {@"track", 40, 16, 0, YES, nil},
-        {@"comment", 120, 16, 0, YES, nil},
-        {@"percentage", 57, 16, 0, YES, nil},
-        {@"words", 120, 16, 0, YES, nil},
-        {@"dupe_count", 80, 16, 0, YES, nil},
-        nil
-    };
-    [[aTable columns] initializeColumns:defs];
-    NSTableColumn *c = [[aTable view] tableColumnWithIdentifier:@"marked"];
-    [[c dataCell] setButtonType:NSSwitchButton];
-    [[c dataCell] setControlSize:NSSmallControlSize];
-    c = [[aTable view] tableColumnWithIdentifier:@"size"];
-    [[c dataCell] setAlignment:NSRightTextAlignment];
-    c = [[aTable view] tableColumnWithIdentifier:@"duration"];
-    [[c dataCell] setAlignment:NSRightTextAlignment];
-    c = [[aTable view] tableColumnWithIdentifier:@"bitrate"];
-    [[c dataCell] setAlignment:NSRightTextAlignment];
-    [[aTable columns] restoreColumns];
-}
-@end
diff --git a/cocoa/me/DetailsPanel.h b/cocoa/me/DetailsPanel.h
deleted file mode 100644
index 0bcdaf4b..00000000
--- a/cocoa/me/DetailsPanel.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import <Cocoa/Cocoa.h>
-#import "DetailsPanelBase.h"
-
-@interface DetailsPanel : DetailsPanelBase
-@end
\ No newline at end of file
diff --git a/cocoa/me/DetailsPanel.m b/cocoa/me/DetailsPanel.m
deleted file mode 100644
index e6c3ad24..00000000
--- a/cocoa/me/DetailsPanel.m
+++ /dev/null
@@ -1,17 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import "DetailsPanel.h"
-#import "DetailsPanel_UI.h"
-
-@implementation DetailsPanel
-- (NSWindow *)createWindow
-{
-    return createDetailsPanel_UI(self);
-}
-@end
diff --git a/cocoa/me/InfoTemplate.plist b/cocoa/me/InfoTemplate.plist
deleted file mode 100644
index e874b401..00000000
--- a/cocoa/me/InfoTemplate.plist
+++ /dev/null
@@ -1,40 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>English</string>
-	<key>CFBundleExecutable</key>
-	<string>dupeGuru</string>
-	<key>CFBundleHelpBookFolder</key>
-	<string>dupeguru_me_help</string>
-	<key>CFBundleHelpBookName</key>
-	<string>dupeGuru ME Help</string>
-	<key>CFBundleIconFile</key>
-	<string>dupeguru</string>
-	<key>CFBundleIdentifier</key>
-	<string>com.hardcoded-software.dupeguru-me</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>dupeGuru ME</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleSignature</key>
-	<string>hsft</string>
-    <key>CFBundleShortVersionString</key>
-    <string>{version}</string>
-	<key>CFBundleVersion</key>
-	<string>{version}</string>
-	<key>NSMainNibFile</key>
-	<string>MainMenu</string>
-	<key>NSPrincipalClass</key>
-	<string>NSApplication</string>
-	<key>NSHumanReadableCopyright</key>
-	<string>© Hardcoded Software, 2016</string>
-	<key>SUFeedURL</key>
-	<string>https://www.hardcoded.net/updates/dupeguru_me.appcast</string>
-	<key>SUPublicDSAKeyFile</key>
-	<string>dsa_pub.pem</string>
-</dict>
-</plist>
diff --git a/cocoa/me/dg_cocoa.py b/cocoa/me/dg_cocoa.py
deleted file mode 100644
index 3dc3f83a..00000000
--- a/cocoa/me/dg_cocoa.py
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-# 
-# This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-# which should be included with this package. The terms are also available at 
-# http://www.gnu.org/licenses/gpl-3.0.html
-
-from hscommon.trans import install_gettext_trans_under_cocoa
-install_gettext_trans_under_cocoa()
-
-from cocoa.inter import PySelectableList, PyColumns, PyTable
-
-from inter.all import *
-from inter.app_me import PyDupeGuru
-
-# When built under virtualenv, the dependency collector misses this module, so we have to force it
-# to see the module.
-import distutils.sysconfig
\ No newline at end of file
diff --git a/cocoa/me/dupeguru.icns b/cocoa/me/dupeguru.icns
deleted file mode 100755
index 42f8641e..00000000
Binary files a/cocoa/me/dupeguru.icns and /dev/null differ
diff --git a/cocoa/pe/AppDelegate.h b/cocoa/pe/AppDelegate.h
deleted file mode 100644
index af7cbaa8..00000000
--- a/cocoa/pe/AppDelegate.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import <Cocoa/Cocoa.h>
-#import "AppDelegateBase.h"
-
-@interface AppDelegate : AppDelegateBase {}
-- (void)clearPictureCache;
-@end
diff --git a/cocoa/pe/AppDelegate.m b/cocoa/pe/AppDelegate.m
deleted file mode 100644
index 8c20946d..00000000
--- a/cocoa/pe/AppDelegate.m
+++ /dev/null
@@ -1,88 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import "AppDelegate.h"
-#import "ProgressController.h"
-#import "Utils.h"
-#import "Dialogs.h"
-#import "ValueTransformers.h"
-#import "Consts.h"
-#import "DetailsPanel.h"
-#import "ResultWindow.h"
-
-@implementation AppDelegate
-+ (NSDictionary *)defaultPreferences
-{
-    NSMutableDictionary *d = [NSMutableDictionary dictionaryWithDictionary:[super defaultPreferences]];
-    [d setObject:i2n(0) forKey:@"scanType"];
-    [d setObject:i2n(95) forKey:@"minMatchPercentage"];
-    [d setObject:b2n(NO) forKey:@"matchScaled"];
-    return d;
-}
-
-- (id)init
-{
-    self = [super init];
-    NSMutableIndexSet *i = [NSMutableIndexSet indexSetWithIndex:0];
-    VTIsIntIn *vtScanTypeIsFuzzy = [[[VTIsIntIn alloc] initWithValues:i reverse:NO] autorelease];
-    [NSValueTransformer setValueTransformer:vtScanTypeIsFuzzy forName:@"vtScanTypeIsFuzzy"];
-    return self;
-}
-
-- (NSString *)homepageURL
-{
-    return @"https://www.hardcoded.net/dupeguru_pe/";
-}
-
-- (DetailsPanel *)createDetailsPanel
-{
-    return [[DetailsPanel alloc] initWithApp:model];
-}
-
-- (void)setScanOptions
-{
-    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
-    [model setScanType:n2i([ud objectForKey:@"scanType"])];
-    [model setMinMatchPercentage:n2i([ud objectForKey:@"minMatchPercentage"])];
-    [model setMixFileKind:n2b([ud objectForKey:@"mixFileKind"])];
-    [model setIgnoreHardlinkMatches:n2b([ud objectForKey:@"ignoreHardlinkMatches"])];
-    [model setMatchScaled:n2b([ud objectForKey:@"matchScaled"])];
-}
-
-- (void)initResultColumns:(ResultTable *)aTable
-{
-    HSColumnDef defs[] = {
-        {@"marked", 26, 26, 26, YES, [NSButtonCell class]},
-        {@"name", 162, 16, 0, YES, nil},
-        {@"folder_path", 142, 16, 0, YES, nil},
-        {@"size", 63, 16, 0, YES, nil},
-        {@"extension", 40, 16, 0, YES, nil},
-        {@"dimensions", 73, 16, 0, YES, nil},
-        {@"exif_timestamp", 120, 16, 0, YES, nil},
-        {@"mtime", 120, 16, 0, YES, nil},
-        {@"percentage", 58, 16, 0, YES, nil},
-        {@"dupe_count", 80, 16, 0, YES, nil},
-        nil
-    };
-    [[aTable columns] initializeColumns:defs];
-    NSTableColumn *c = [[aTable view] tableColumnWithIdentifier:@"marked"];
-    [[c dataCell] setButtonType:NSSwitchButton];
-    [[c dataCell] setControlSize:NSSmallControlSize];
-    c = [[aTable view] tableColumnWithIdentifier:@"size"];
-    [[c dataCell] setAlignment:NSRightTextAlignment];
-    [[aTable columns] restoreColumns];
-}
-
-- (void)clearPictureCache
-{
-    NSString *msg = NSLocalizedString(@"Do you really want to remove all your cached picture analysis?", @"");
-    if ([Dialogs askYesNo:msg] == NSAlertSecondButtonReturn) // NO
-        return;
-    [model clearPictureCache];
-}
-@end
diff --git a/cocoa/pe/Consts.h b/cocoa/pe/Consts.h
deleted file mode 100644
index 002a88ef..00000000
--- a/cocoa/pe/Consts.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import "../base/Consts.h"
-
-#define ImageLoadedNotification @"ImageLoadedNotification"
diff --git a/cocoa/pe/InfoTemplate.plist b/cocoa/pe/InfoTemplate.plist
deleted file mode 100644
index 2dee7023..00000000
--- a/cocoa/pe/InfoTemplate.plist
+++ /dev/null
@@ -1,40 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>English</string>
-	<key>CFBundleExecutable</key>
-	<string>dupeGuru</string>
-	<key>CFBundleHelpBookFolder</key>
-	<string>dupeguru_pe_help</string>
-	<key>CFBundleHelpBookName</key>
-	<string>dupeGuru PE Help</string>
-	<key>CFBundleIconFile</key>
-	<string>dupeguru</string>
-	<key>CFBundleIdentifier</key>
-	<string>com.hardcoded-software.dupeguru-pe</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>dupeGuru PE</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleSignature</key>
-	<string>hsft</string>
-    <key>CFBundleShortVersionString</key>
-    <string>{version}</string>
-	<key>CFBundleVersion</key>
-	<string>{version}</string>
-	<key>NSMainNibFile</key>
-	<string>MainMenu</string>
-	<key>NSPrincipalClass</key>
-	<string>NSApplication</string>
-	<key>NSHumanReadableCopyright</key>
-	<string>© Hardcoded Software, 2016</string>
-	<key>SUFeedURL</key>
-	<string>https://www.hardcoded.net/updates/dupeguru_pe.appcast</string>
-	<key>SUPublicDSAKeyFile</key>
-	<string>dsa_pub.pem</string>
-</dict>
-</plist>
diff --git a/cocoa/pe/dg_cocoa.py b/cocoa/pe/dg_cocoa.py
deleted file mode 100644
index bcf75f39..00000000
--- a/cocoa/pe/dg_cocoa.py
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-# 
-# This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-# which should be included with this package. The terms are also available at 
-# http://www.gnu.org/licenses/gpl-3.0.html
-
-from hscommon.trans import install_gettext_trans_under_cocoa
-install_gettext_trans_under_cocoa()
-
-from cocoa.inter import PySelectableList, PyColumns, PyTable
-
-from inter.all import *
-from inter.app_pe import PyDupeGuru
-    
-# When built under virtualenv, the dependency collector misses this module, so we have to force it
-# to see the module.
-import distutils.sysconfig
\ No newline at end of file
diff --git a/cocoa/pe/dupeguru.icns b/cocoa/pe/dupeguru.icns
deleted file mode 100755
index c143ed86..00000000
Binary files a/cocoa/pe/dupeguru.icns and /dev/null differ
diff --git a/cocoa/se/AppDelegate.h b/cocoa/se/AppDelegate.h
deleted file mode 100644
index e04ed83f..00000000
--- a/cocoa/se/AppDelegate.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import <Cocoa/Cocoa.h>
-#import "AppDelegateBase.h"
-#import "PyDupeGuru.h"
-
-@interface AppDelegate : AppDelegateBase {}
-@end
diff --git a/cocoa/se/AppDelegate.m b/cocoa/se/AppDelegate.m
deleted file mode 100644
index 7f666fe0..00000000
--- a/cocoa/se/AppDelegate.m
+++ /dev/null
@@ -1,85 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import "AppDelegate.h"
-#import "ProgressController.h"
-#import "Utils.h"
-#import "ValueTransformers.h"
-#import "DetailsPanel.h"
-#import "DirectoryPanel.h"
-#import "ResultWindow.h"
-#import "Consts.h"
-
-@implementation AppDelegate
-+ (NSDictionary *)defaultPreferences
-{
-    NSMutableDictionary *d = [NSMutableDictionary dictionaryWithDictionary:[super defaultPreferences]];
-    [d setObject:i2n(1) forKey:@"scanType"];
-    [d setObject:i2n(80) forKey:@"minMatchPercentage"];
-    [d setObject:i2n(30) forKey:@"smallFileThreshold"];
-    [d setObject:b2n(YES) forKey:@"wordWeighting"];
-    [d setObject:b2n(NO) forKey:@"matchSimilarWords"];
-    [d setObject:b2n(YES) forKey:@"ignoreSmallFiles"];
-    return d;
-}
-
-- (id)init
-{
-    self = [super init];
-    NSMutableIndexSet *contentsIndexes = [NSMutableIndexSet indexSet];
-    [contentsIndexes addIndex:1];
-    [contentsIndexes addIndex:2];
-    VTIsIntIn *vt = [[[VTIsIntIn alloc] initWithValues:contentsIndexes reverse:YES] autorelease];
-    [NSValueTransformer setValueTransformer:vt forName:@"vtScanTypeIsNotContent"];
-    _directoryPanel = nil;
-    return self;
-}
-
-- (NSString *)homepageURL
-{
-    return @"http://www.hardcoded.net/dupeguru/";
-}
-
-- (void)setScanOptions
-{
-    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
-    [model setScanType:n2i([ud objectForKey:@"scanType"])];
-    [model setMinMatchPercentage:n2i([ud objectForKey:@"minMatchPercentage"])];
-    [model setWordWeighting:n2b([ud objectForKey:@"wordWeighting"])];
-    [model setMixFileKind:n2b([ud objectForKey:@"mixFileKind"])];
-    [model setIgnoreHardlinkMatches:n2b([ud objectForKey:@"ignoreHardlinkMatches"])];
-    [model setMatchSimilarWords:n2b([ud objectForKey:@"matchSimilarWords"])];
-    int smallFileThreshold = [ud integerForKey:@"smallFileThreshold"]; // In KB
-    int sizeThreshold = [ud boolForKey:@"ignoreSmallFiles"] ? smallFileThreshold * 1024 : 0; // The py side wants bytes
-    [model setSizeThreshold:sizeThreshold];
-}
-
-- (void)initResultColumns:(ResultTable *)aTable
-{
-    HSColumnDef defs[] = {
-        {@"marked", 26, 26, 26, YES, [NSButtonCell class]},
-        {@"name", 195, 16, 0, YES, nil},
-        {@"folder_path", 183, 16, 0, YES, nil},
-        {@"size", 63, 16, 0, YES, nil},
-        {@"extension", 40, 16, 0, YES, nil},
-        {@"mtime", 120, 16, 0, YES, nil},
-        {@"percentage", 60, 16, 0, YES, nil},
-        {@"words", 120, 16, 0, YES, nil},
-        {@"dupe_count", 80, 16, 0, YES, nil},
-        nil
-    };
-    [[aTable columns] initializeColumns:defs];
-    NSTableColumn *c = [[aTable view] tableColumnWithIdentifier:@"marked"];
-    [[c dataCell] setButtonType:NSSwitchButton];
-    [[c dataCell] setControlSize:NSSmallControlSize];
-    c = [[aTable view] tableColumnWithIdentifier:@"size"];
-    [[c dataCell] setAlignment:NSRightTextAlignment];
-    [[aTable columns] restoreColumns];
-}
-
-@end
diff --git a/cocoa/se/DetailsPanel.h b/cocoa/se/DetailsPanel.h
deleted file mode 100644
index 0bcdaf4b..00000000
--- a/cocoa/se/DetailsPanel.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import <Cocoa/Cocoa.h>
-#import "DetailsPanelBase.h"
-
-@interface DetailsPanel : DetailsPanelBase
-@end
\ No newline at end of file
diff --git a/cocoa/se/DetailsPanel.m b/cocoa/se/DetailsPanel.m
deleted file mode 100644
index e6c3ad24..00000000
--- a/cocoa/se/DetailsPanel.m
+++ /dev/null
@@ -1,17 +0,0 @@
-/* 
-Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-
-This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-which should be included with this package. The terms are also available at 
-http://www.gnu.org/licenses/gpl-3.0.html
-*/
-
-#import "DetailsPanel.h"
-#import "DetailsPanel_UI.h"
-
-@implementation DetailsPanel
-- (NSWindow *)createWindow
-{
-    return createDetailsPanel_UI(self);
-}
-@end
diff --git a/cocoa/base/ui/deletion_options.py b/cocoa/ui/deletion_options.py
similarity index 100%
rename from cocoa/base/ui/deletion_options.py
rename to cocoa/ui/deletion_options.py
diff --git a/cocoa/base/ui/details_panel.py b/cocoa/ui/details_panel.py
similarity index 100%
rename from cocoa/base/ui/details_panel.py
rename to cocoa/ui/details_panel.py
diff --git a/cocoa/pe/ui/details_panel.py b/cocoa/ui/details_panel_picture.py
similarity index 96%
rename from cocoa/pe/ui/details_panel.py
rename to cocoa/ui/details_panel_picture.py
index 1a1efbd8..5d0d110b 100644
--- a/cocoa/pe/ui/details_panel.py
+++ b/cocoa/ui/details_panel_picture.py
@@ -1,5 +1,5 @@
-ownerclass = 'DetailsPanel'
-ownerimport = 'DetailsPanel.h'
+ownerclass = 'DetailsPanelPicture'
+ownerimport = 'DetailsPanelPicture.h'
 
 result = Panel(593, 398, "Details of Selected File")
 table = TableView(result)
diff --git a/cocoa/base/ui/directory_panel.py b/cocoa/ui/directory_panel.py
similarity index 77%
rename from cocoa/base/ui/directory_panel.py
rename to cocoa/ui/directory_panel.py
index 01587102..9f362173 100644
--- a/cocoa/base/ui/directory_panel.py
+++ b/cocoa/ui/directory_panel.py
@@ -5,6 +5,8 @@ result = Window(425, 300, "dupeGuru")
 promptLabel = Label(result, "Select folders to scan and press \"Scan\".")
 directoryOutline = OutlineView(result)
 directoryOutline.OBJC_CLASS = 'HSOutlineView'
+appModeSelector = SegmentedControl(result)
+appModeLabel = Label(result, "Application Mode:")
 scanTypePopup = Popup(result)
 scanTypeLabel = Label(result, "Scan Type:")
 addButton = Button(result, "")
@@ -15,6 +17,7 @@ addPopup = Popup(None)
 loadRecentPopup = Popup(None)
 
 owner.outlineView = directoryOutline
+owner.appModeSelector = appModeSelector
 owner.scanTypePopup = scanTypePopup
 owner.removeButton = removeButton
 owner.loadResultsButton = loadResultsButton
@@ -23,7 +26,9 @@ owner.loadRecentButtonPopUp = loadRecentPopup
 
 result.autosaveName = 'DirectoryPanel'
 result.canMinimize = False
-result.minSize = Size(370, 270)
+result.minSize = Size(400, 270)
+for label in ["Standard", "Music", "Picture"]:
+    appModeSelector.addSegment(label, 80)
 addButton.bezelStyle = removeButton.bezelStyle = const.NSTexturedRoundedBezelStyle
 addButton.image = 'NSAddTemplate'
 removeButton.image = 'NSRemoveTemplate'
@@ -31,6 +36,7 @@ for button in (addButton, removeButton):
     button.style = const.NSTexturedRoundedBezelStyle
     button.imagePosition = const.NSImageOnly
 scanButton.keyEquivalent = '\\r'
+appModeSelector.action = Action(owner, 'changeAppMode:')
 addButton.action = Action(owner, 'popupAddDirectoryMenu:')
 removeButton.action = Action(owner, 'removeSelectedDirectory')
 loadResultsButton.action = Action(owner, 'popupLoadRecentMenu:')
@@ -49,8 +55,10 @@ directoryOutline.allowsColumnReordering = False
 directoryOutline.allowsColumnSelection = False
 directoryOutline.allowsMultipleSelection = True
 
-scanTypeLabel.width = 90
-scanTypeLayout = HLayout([scanTypeLabel, scanTypePopup], filler=scanTypePopup)
+appModeLabel.width = scanTypeLabel.width = 110
+scanTypePopup.width = 248
+appModeLayout = HLayout([appModeLabel, appModeSelector])
+scanTypeLayout = HLayout([scanTypeLabel, scanTypePopup])
 
 for button in (addButton, removeButton):
     button.width = 28
@@ -58,15 +66,11 @@ for button in (loadResultsButton, scanButton):
     button.width = 118
 
 buttonLayout = HLayout([addButton, removeButton, None, loadResultsButton, scanButton])
-bottomLayout = VLayout([None, scanTypeLayout, buttonLayout])
-promptLabel.packToCorner(Pack.UpperLeft)
-promptLabel.fill(Pack.Right)
+mainLayout = VLayout([appModeLayout, scanTypeLayout, promptLabel, directoryOutline, buttonLayout], filler=directoryOutline)
+mainLayout.packToCorner(Pack.UpperLeft)
+mainLayout.fill(Pack.LowerRight)
 directoryOutline.packRelativeTo(promptLabel, Pack.Below)
-bottomLayout.packRelativeTo(directoryOutline, Pack.Below, margin=8)
-directoryOutline.fill(Pack.LowerRight)
-bottomLayout.fill(Pack.Right)
 
 promptLabel.setAnchor(Pack.UpperLeft, growX=True)
 directoryOutline.setAnchor(Pack.UpperLeft, growX=True, growY=True)
-scanTypeLayout.setAnchor(Pack.Below)
 buttonLayout.setAnchor(Pack.Below)
diff --git a/cocoa/base/ui/ignore_list_dialog.py b/cocoa/ui/ignore_list_dialog.py
similarity index 100%
rename from cocoa/base/ui/ignore_list_dialog.py
rename to cocoa/ui/ignore_list_dialog.py
diff --git a/cocoa/base/ui/main_menu.py b/cocoa/ui/main_menu.py
similarity index 95%
rename from cocoa/base/ui/main_menu.py
rename to cocoa/ui/main_menu.py
index 3f9e8255..4c6a8ce3 100644
--- a/cocoa/base/ui/main_menu.py
+++ b/cocoa/ui/main_menu.py
@@ -1,6 +1,5 @@
-ownerclass = 'AppDelegateBase'
-ownerimport = 'AppDelegateBase.h'
-edition = args.get('edition', 'se')
+ownerclass = 'AppDelegate'
+ownerimport = 'AppDelegate.h'
 
 result = Menu("")
 appMenu = result.addMenu("dupeGuru")
@@ -30,8 +29,7 @@ owner.recentResultsMenu = fileMenu.addMenu("Load Recent Results")
 fileMenu.addItem("Save Results...", Action(None, 'saveResults'), 'cmd+s')
 fileMenu.addItem("Export Results to XHTML", Action(owner.model, 'exportToXHTML'), 'cmd+shift+e')
 fileMenu.addItem("Export Results to CSV", Action(owner.model, 'exportToCSV'))
-if edition == 'pe':
-    fileMenu.addItem("Clear Picture Cache", Action(owner, 'clearPictureCache'), 'cmd+shift+p')
+fileMenu.addItem("Clear Picture Cache", Action(owner, 'clearPictureCache'), 'cmd+shift+p')
 
 editMenu.addItem("Mark All", Action(None, 'markAll'), 'cmd+a')
 editMenu.addItem("Mark None", Action(None, 'markNone'), 'cmd+shift+a')
diff --git a/cocoa/base/ui/preferences_panel.py b/cocoa/ui/preferences_panel.py
similarity index 87%
rename from cocoa/base/ui/preferences_panel.py
rename to cocoa/ui/preferences_panel.py
index 84a170ed..227bc681 100644
--- a/cocoa/base/ui/preferences_panel.py
+++ b/cocoa/ui/preferences_panel.py
@@ -1,16 +1,11 @@
-edition = args.get('edition', 'se')
-dialogTitles = {
-    'se': "dupeGuru Preferences",
-    'me': "dupeGuru ME Preferences",
-    'pe': "dupeGuru PE Preferences",
-}
+appmode = args.get('appmode', 'standard')
 dialogHeights = {
-    'se': 325,
-    'me': 345,
-    'pe': 255,
+    'standard': 325,
+    'music': 345,
+    'picture': 255,
 }
 
-result = Window(410, dialogHeights[edition], dialogTitles[edition])
+result = Window(410, dialogHeights[appmode], "dupeGuru Preferences")
 tabView = TabView(result)
 basicTab = tabView.addTab("Basic")
 advancedTab = tabView.addTab("Advanced")
@@ -21,19 +16,19 @@ fewerResultsLabel = Label(basicTab.view, "Fewer results")
 thresholdValueLabel = Label(basicTab.view, "")
 fontSizeCombo = Combobox(basicTab.view, ["11", "12", "13", "14", "18", "24"])
 fontSizeLabel = Label(basicTab.view, "Font Size:")
-if edition in ('se', 'me'):
+if appmode in ('standard', 'music'):
     wordWeightingBox = Checkbox(basicTab.view, "Word weighting")
     matchSimilarWordsBox = Checkbox(basicTab.view, "Match similar words")
-elif edition == 'pe':
+elif appmode == 'picture':
     matchDifferentDimensionsBox = Checkbox(basicTab.view, "Match pictures of different dimensions")
 mixKindBox = Checkbox(basicTab.view, "Can mix file kind")
 removeEmptyFoldersBox = Checkbox(basicTab.view, "Remove empty folders on delete or move")
 checkForUpdatesBox = Checkbox(basicTab.view, "Automatically check for updates")
-if edition == 'se':
+if appmode == 'standard':
     ignoreSmallFilesBox = Checkbox(basicTab.view, "Ignore files smaller than:")
     smallFilesThresholdText = TextField(basicTab.view, "")
     smallFilesThresholdSuffixLabel = Label(basicTab.view, "KB")
-elif edition == 'me':
+elif appmode == 'music':
     tagsToScanLabel = Label(basicTab.view, "Tags to scan:")
     trackBox = Checkbox(basicTab.view, "Track")
     artistBox = Checkbox(basicTab.view, "Artist")
@@ -63,27 +58,29 @@ ignoreHardlinksBox.bind('value', defaults, 'values.ignoreHardlinkMatches')
 debugModeCheckbox.bind('value', defaults, 'values.DebugMode')
 customCommandText.bind('value', defaults, 'values.CustomCommand')
 copyMovePopup.bind('selectedIndex', defaults, 'values.recreatePathType')
-if edition in ('se', 'me'):
+if appmode in ('standard', 'music'):
     wordWeightingBox.bind('value', defaults, 'values.wordWeighting')
     matchSimilarWordsBox.bind('value', defaults, 'values.matchSimilarWords')
     disableWhenContentScan = [thresholdSlider, wordWeightingBox, matchSimilarWordsBox]
     for control in disableWhenContentScan:
-        control.bind('enabled', defaults, 'values.scanType', valueTransformer='vtScanTypeIsNotContent')
-    if edition == 'se':
+        vtname = 'vtScanTypeMusicIsNotContent' if appmode == 'music' else 'vtScanTypeIsNotContent'
+        prefname = 'values.scanTypeMusic' if appmode == 'music' else 'values.scanTypeStandard'
+        control.bind('enabled', defaults, prefname, valueTransformer=vtname)
+    if appmode == 'standard':
         ignoreSmallFilesBox.bind('value', defaults, 'values.ignoreSmallFiles')
         smallFilesThresholdText.bind('value', defaults, 'values.smallFileThreshold')
-    elif edition == 'me':
+    elif appmode == 'music':
         for box in tagBoxes:
-            box.bind('enabled', defaults, 'values.scanType', valueTransformer='vtScanTypeIsTag')
+            box.bind('enabled', defaults, 'values.scanTypeMusic', valueTransformer='vtScanTypeIsTag')
         trackBox.bind('value', defaults, 'values.scanTagTrack')
         artistBox.bind('value', defaults, 'values.scanTagArtist')
         albumBox.bind('value', defaults, 'values.scanTagAlbum')
         titleBox.bind('value', defaults, 'values.scanTagTitle')
         genreBox.bind('value', defaults, 'values.scanTagGenre')
         yearBox.bind('value', defaults, 'values.scanTagYear')
-elif edition == 'pe':
+elif appmode == 'picture':
     matchDifferentDimensionsBox.bind('value', defaults, 'values.matchScaled')
-    thresholdSlider.bind('enabled', defaults, 'values.scanType', valueTransformer='vtScanTypeIsFuzzy')
+    thresholdSlider.bind('enabled', defaults, 'values.scanTypePicture', valueTransformer='vtScanTypeIsFuzzy')
 
 result.canResize = False
 result.canMinimize = False
@@ -93,13 +90,13 @@ allLabels = [thresholdValueLabel, moreResultsLabel, fewerResultsLabel,
     thresholdLabel, fontSizeLabel, customCommandLabel, copyMoveLabel]
 allCheckboxes = [mixKindBox, removeEmptyFoldersBox, checkForUpdatesBox, regexpCheckbox,
     ignoreHardlinksBox, debugModeCheckbox]
-if edition == 'se':
+if appmode == 'standard':
     allLabels += [smallFilesThresholdSuffixLabel]
     allCheckboxes += [ignoreSmallFilesBox, wordWeightingBox, matchSimilarWordsBox]
-elif edition == 'me':
+elif appmode == 'music':
     allLabels += [tagsToScanLabel]
     allCheckboxes += tagBoxes + [wordWeightingBox, matchSimilarWordsBox]
-elif edition == 'pe':
+elif appmode == 'picture':
     allCheckboxes += [matchDifferentDimensionsBox]
 for label in allLabels:
     label.controlSize = ControlSize.Small
@@ -112,10 +109,10 @@ thresholdLabel.width = fontSizeLabel.width = 94
 fontSizeCombo.width = 66
 thresholdValueLabel.width = 25
 resetToDefaultsButton.width = 136
-if edition == 'se':
+if appmode == 'standard':
     smallFilesThresholdText.width = 60
     smallFilesThresholdSuffixLabel.width = 40
-elif edition == 'me':
+elif appmode == 'music':
     for box in tagBoxes:
         box.width = 70
 
@@ -135,7 +132,7 @@ fewerResultsLabel.packRelativeTo(thresholdSlider, Pack.Below, align=Pack.Right,
 fontSizeCombo.packRelativeTo(moreResultsLabel, Pack.Below)
 fontSizeLabel.packRelativeTo(fontSizeCombo, Pack.Left)
 
-if edition == 'me':
+if appmode == 'music':
     tagsToScanLabel.packRelativeTo(fontSizeCombo, Pack.Below)
     tagsToScanLabel.fill(Pack.Left)
     tagsToScanLabel.fill(Pack.Right)
@@ -150,13 +147,13 @@ if edition == 'me':
 else:
     viewToPackCheckboxesUnder = fontSizeCombo
 
-if edition == 'se':
+if appmode == 'standard':
     checkboxesToLayout = [wordWeightingBox, matchSimilarWordsBox, mixKindBox, removeEmptyFoldersBox,
         ignoreSmallFilesBox]
-elif edition == 'me':
+elif appmode == 'music':
     checkboxesToLayout = [wordWeightingBox, matchSimilarWordsBox, mixKindBox, removeEmptyFoldersBox,
         checkForUpdatesBox]
-elif edition == 'pe':
+elif appmode == 'picture':
     checkboxesToLayout = [matchDifferentDimensionsBox, mixKindBox, removeEmptyFoldersBox,
         checkForUpdatesBox]
 checkboxLayout = VLayout(checkboxesToLayout)
@@ -164,7 +161,7 @@ checkboxLayout.packRelativeTo(viewToPackCheckboxesUnder, Pack.Below)
 checkboxLayout.fill(Pack.Left)
 checkboxLayout.fill(Pack.Right)
 
-if edition == 'se':
+if appmode == 'standard':
     smallFilesThresholdText.packRelativeTo(ignoreSmallFilesBox, Pack.Below, margin=4)
     checkForUpdatesBox.packRelativeTo(smallFilesThresholdText, Pack.Below, margin=4)
     checkForUpdatesBox.fill(Pack.Right)
diff --git a/cocoa/base/ui/prioritize_dialog.py b/cocoa/ui/prioritize_dialog.py
similarity index 100%
rename from cocoa/base/ui/prioritize_dialog.py
rename to cocoa/ui/prioritize_dialog.py
diff --git a/cocoa/base/ui/problem_dialog.py b/cocoa/ui/problem_dialog.py
similarity index 100%
rename from cocoa/base/ui/problem_dialog.py
rename to cocoa/ui/problem_dialog.py
diff --git a/cocoa/base/ui/result_window.py b/cocoa/ui/result_window.py
similarity index 100%
rename from cocoa/base/ui/result_window.py
rename to cocoa/ui/result_window.py
diff --git a/cocoa/wscript b/cocoa/wscript
index 9ce28eec..89acb3dc 100644
--- a/cocoa/wscript
+++ b/cocoa/wscript
@@ -9,13 +9,8 @@ out = 'build'
 
 def options(opt):
     opt.load('compiler_c python')
-    opt.add_option('--edition', default='se', help="dupeGuru edition to build (se, me pe)")
 
 def configure(conf):
-    if conf.options.edition not in ('se', 'me', 'pe'):
-        conf.options.edition = 'se'
-    print("Building dupeGuru {}".format(conf.options.edition.upper()))
-    conf.env.DGEDITION = conf.options.edition
     # We use clang to compile our app
     conf.env.CC = 'clang'
     # WAF has a "pyembed" feature allowing us to automatically find Python and compile by linking
@@ -31,7 +26,7 @@ def configure(conf):
         os.symlink('../build/Python', versioned_dylib_path)
     # The rest is standard WAF code that you can find the the python and macapp demos.
     conf.load('compiler_c python')
-    conf.check_python_version((3,3,0))
+    conf.check_python_version((3,4,0))
     conf.check_python_headers()
     conf.env.FRAMEWORK_COCOA = 'Cocoa'
     conf.env.ARCH_COCOA = ['x86_64']
@@ -53,8 +48,8 @@ def build(ctx):
         'controllers/HSOutline', 'controllers/HSPopUpList', 'controllers/HSSelectableList',
         'controllers/HSTextField', 'controllers/HSProgressWindow']
     cocoalib_src = [cocoalib_node.find_node(usename + '.m') for usename in cocoalib_uses] + cocoalib_node.ant_glob('autogen/*.m')
-    project_folders = ['autogen', 'base', ctx.env.DGEDITION]
-    project_src = sum([ctx.srcnode.ant_glob('%s/*.m' % folder) for folder in project_folders], [])
+    project_folders = [ctx.srcnode, ctx.srcnode.find_dir('autogen')]
+    project_src = ctx.srcnode.ant_glob('autogen/*.m') + ctx.srcnode.ant_glob('*.m')
     
     # Compile
     ctx.program(
diff --git a/core/app.py b/core/app.py
index a5fcedde..1da07a52 100644
--- a/core/app.py
+++ b/core/app.py
@@ -323,6 +323,14 @@ class DupeGuru(Broadcaster):
         self.notify('dupes_selected')
 
     #--- Protected
+    def _get_fileclasses(self):
+        if self.app_mode == AppMode.Picture:
+            return [pe.photo.PLAT_SPECIFIC_PHOTO_CLASS]
+        elif self.app_mode == AppMode.Music:
+            return [me.fs.MusicFile]
+        else:
+            return [se.fs.File]
+    
     def _prioritization_categories(self):
         if self.app_mode == AppMode.Picture:
             return pe.prioritize.all_categories()
@@ -743,7 +751,7 @@ class DupeGuru(Broadcaster):
         def do(j):
             j.set_progress(0, tr("Collecting files to scan"))
             if scanner.scan_type == ScanType.Folders:
-                files = list(self.directories.get_folders(folderclass=se.fs.folder, j=j))
+                files = list(self.directories.get_folders(folderclass=se.fs.Folder, j=j))
             else:
                 files = list(self.directories.get_files(fileclasses=self.fileclasses, j=j))
             if self.options['ignore_hardlink_matches']:
@@ -794,12 +802,7 @@ class DupeGuru(Broadcaster):
 
     @property
     def fileclasses(self):
-        if self.app_mode == AppMode.Picture:
-            return [pe.photo.PLAT_SPECIFIC_PHOTO_CLASS]
-        elif self.app_mode == AppMode.Music:
-            return [me.fs.MusicFile]
-        else:
-            return [se.fs.File]
+        return self._get_fileclasses()
 
     @property
     def SCANNER_CLASS(self):