Index: trunk/ChameleonPrefPane/Sources/ChameleonPrefPane.h
===================================================================
--- trunk/ChameleonPrefPane/Sources/ChameleonPrefPane.h	(revision 17)
+++ trunk/ChameleonPrefPane/Sources/ChameleonPrefPane.h	(revision 18)
@@ -29,13 +29,14 @@
 	IBOutlet NSBox*				mOptions;
     IBOutlet SFAuthorizationView *authView;
 
-	NSImage *					mMacOSXImage;
-	NSImage *					mWindowsImage;
-	NSImage *					mLinuxImage;
-	NSImage *					mUnknownImage;
-	NSImage *					mCDROMImage;
-	NSMutableDictionary *mOptionsDict;
-	NSString * mOptionsPlistPath;
+	NSImage*					mMacOSXImage;
+	NSImage*					mWindowsImage;
+	NSImage*					mLinuxImage;
+	NSImage*					mUnknownImage;
+	NSImage*					mCDROMImage;
+	NSMutableDictionary*		mOptionsDict;
+	NSString*					mOptionsPlistPath;
+	int							mPreferenceFileVersion; 
 }
 
 
Index: trunk/ChameleonPrefPane/Sources/ChameleonPrefPane.mm
===================================================================
--- trunk/ChameleonPrefPane/Sources/ChameleonPrefPane.mm	(revision 17)
+++ trunk/ChameleonPrefPane/Sources/ChameleonPrefPane.mm	(revision 18)
@@ -30,6 +30,8 @@
 static const char* const kRenamePartition = "Rename Partition";
 
 static const NSString* const kPreferencesFilePath =  @"/Library/Preferences/com.chameleon.prefPane.plist";
+static const NSString* const keyPreferencesFileVersion =  @"version"; // for future back compatibility
+static const int CurrentPreferencesFileVersion =  0x01; // for future back compatibility
 static const NSString* const keyForceBootConfigPath =  @"forceBootConfigPath";
 static const NSString* const keySwapHD01 =  @"swapHD01";
 static const NSString* const keySwapHD02 =  @"swapHD02";
@@ -113,6 +115,7 @@
 								kPreferencesFilePath ] retain];
     if (oldGlobalPreferences!=nil)
 	{
+		mPreferenceFileVersion= [[oldGlobalPreferences objectForKey: keyPreferencesFileVersion] intValue ];
 		[mSwapHD01 setIntValue: [[oldGlobalPreferences objectForKey:	keySwapHD01] intValue]];
 		[mSwapHD02 setIntValue: [[oldGlobalPreferences objectForKey:	keySwapHD02] intValue]];
 		[mFreezeParts setIntValue: [[oldGlobalPreferences objectForKey: keyUseFrozenParts] intValue] ];
@@ -125,6 +128,8 @@
 		
 		// Initialize defaults
 		oldGlobalPreferences = [[NSMutableDictionary alloc] init];
+		[oldGlobalPreferences setObject: [[NSNumber alloc] initWithInt: CurrentPreferencesFileVersion] 
+								 forKey: keyPreferencesFileVersion];
 		[oldGlobalPreferences setObject: [[NSNumber alloc] initWithBool: false] forKey: keySwapHD01];
 		[oldGlobalPreferences setObject: [[NSNumber alloc] initWithBool: false] forKey: keySwapHD02];
 		[oldGlobalPreferences setObject:[[NSNumber alloc] initWithBool:  false] forKey: keyUseFrozenParts];