IOS: (not) playing sound from local file system - Error #2032

Dear all,

I am working on an app where I want to (among others) play sound files from the local file system.

I have added a few mp3 files into my .ipa file.

With a small file browser in my app I can select any one of them which returns me a File object.

I then use this File object to do a URLRequest to load the sound:

var req:URLRequest = new URLRequest(file.nativePath);

sound = new Sound();

sound.addEventListener(IOErrorEvent.IO_ERROR, soundLoadError);
sound.addEventListener(Event.COMPLETE, soundLoaded);
sound.load(req);

It works in flash, but fails on the iPAD. Everytime I try to load, I get a IOErrorEvent with error code Error #2032

When I replace new URLRequest(file.nativePath) with URLRequest("http://.../testfile.mp3"), everything works fine!

Any help appreciated.

Is this a matter of Security settings? Can I change those?

Something to do with Sandboxing (whatever that is)?

or something to do with cross-domain access?

I have been looking around for days now and any help would be appreciated!

I am using Flash CS5.5 & AIR 2.7

Thanks, Marcus.