File Load is not working on Mac but Windows

Hi i'm developing an app which simply load files (images and sounds) and uses binary data. Application is working fine on Windows, but it raises error on Mac.

Now i dont own Mac so i cant debug it, I also googled but couldnt find anything close to it.

Please advise

Thanks

PS: Its an AIR APP

Here are snippets to understand the code

//browse file
_loadFile.addEventListener(Event.SELECT, selectHandler);
_loadFile.browseForOpen(title, typeFilter);

//selectHandler
_loadFile.addEventListener(Event.COMPLETE, loadCompleteHandler);
_loadFile.load();

//loadCompleteHandler
//works on windows but TypeError on Mac

switch(file.type.toLowerCase()){


  case ".mp3":  var sound:Sound = new Sound();  sound.loadCompressedDataFromByteArray(file.data, file.data.length);  fileHandler(sound);  break;  case ".jpg":  case ".png":  case ".jpeg":  case ".gif":   loader = new Loader();  loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadBytesHandler);  loader.loadBytes(file.data);  break;  }


//loadBytesHandler
fileHandler(loader.content);