NSFileManager:enumeratorAtURL: returns a different form of URL to NSFileManager:URLForDirectory
===

If I fetch my sandbox's Application Support directory using NSFileManager:URLForDirectory then I get back the following URL:

    file://localhost/var/mobile/Applications/EA80DE91-394C-4EAB-B269-1081C859BB0F/Library/Application%20Support/

However if I use NSFileManager:enumeratorAtURL to search the directory I get back URLs of the form:

    file://localhost/private/var/mobile/Applications/EA80DE91-394C-4EAB-B269-1081C859BB0F/Library/Application%20Support/

This is causing me problems because I'm doing url search/replace manipulations and the difference causes a mis-match. I've run into this sort of difference elsewhere previously and my solution then was to use the path of the urls (using NSURL:path) instead of the raw urls, however that won't work in this situation as the paths produced are:

    /var/mobile/Applications/EA80DE91-394C-4EAB-B269-1081C859BB0F/Library/Application Support
    /private/var/mobile/Applications/EA80DE91-394C-4EAB-B269-1081C859BB0F/Library/Application Support/


What I am trying to do is this - I can have any number of files in my Application Support directory with the same name but different locations, and I need to extract the path  relative to the Application Support directory. i.e. if I have the following

    /Application Support/abc/file.dat
    /ApplicationSupport/abc/def/file.dat

I want to be able to extract "abc" and "abc/def". I was doing this using the following code:

    NSArray *keys = [NSArray arrayWithObject:NSURLIsRegularFileKey];
    NSDirectoryEnumerator *dirEnumerator = [self.fileManager enumeratorAtURL:[MyManager appSupportDirectory]
                                              includingPropertiesForKeys:keys
                                                                 options:NSDirectoryEnumerationSkipsHiddenFiles
                                                            errorHandler:nil];
        for (NSURL *url in dirEnumerator)
        {
            if ( NSOrderedSame == [[url lastPathComponent] caseInsensitiveCompare:kFilename])
            {
                NSString *appSupportPath = [[MyManager appSupportDirectory] path];
                NSString *pathToFile = [url path];
                pathToFile = [pathToFile URLByDeletingLastPathComponent];
                NSString *subPath = [pathToFile  stringByReplacingOccurrencesOfString:appSupportPath withString:@""];

(MyManager:appSupportDirectory calls NSFileManager:URLForDirectory: using NSApplicationSupportDirectory)


This works fine on the simulator where enumeratorAtURL: and URLFOrDirectory: return identical paths, but due to their differences on hardware it fails.

Is there a way to get enumeratorAtURL: and URLForDirectory to return identical paths, or if not is there an alternative elegant way of extracting the subpaths to what I am currently doing?

TIA