var loader:Loader = new Loader();

        var request:URLRequest = new URLRequest("http://videos.hd-trailers.net/thehobbit2-sneakpeek_h1080p.mov");        

        var loaderContext:LoaderContext = new LoaderContext(false, ApplicationDomain.currentDomain, null);

        loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadHand);

        loader.load(request, loaderContext);

function loadHand(e:Event):void{

        var file:File = File.applicationStorageDirectory.resolvePath("thehobbit2-sneakpeek_h1080p.mov"); 

        var wr:File = new File(file.nativePath);

        var stream:FileStream = new FileStream();

                stream.open(wr,FileMode.WRITE);

                stream.writeBytes(e.target.bytes, 0, e.target.bytesTotal); 

                stream.close();

}