Can I use a NSData file from OS X in iOS

Question

I have a level editor for my iOS App and it's running on OS X. It saves the levels in an archived NSData-Object. These files are inside my apps bundle and I try to load them on the iOS app using:

NSString* path_ = [dictionary_ objectForKey:kWDLevelController_Level_PathKey];
NSString* sourcePath_ = [[NSBundle mainBundle] pathForResource:path_ ofType:@"wds"];

NSData* data_ = [NSData dataWithContentsOfFile:sourcePath_ 
                                       options:NSDataReadingMappedIfSafe error:&error];
dataSource_ = [NSKeyedUnarchiver unarchiveObjectWithData:data_];

The returned NSData object is empty. I checked the path of the NSData-File inside the bundle and it's correct. I guess that it's the problem that the file was created on OS X and that I want to deserialize it on iOS.

Is there a way to do this? Or do I have to write my own serialization class or use any third-party?