async void SetAudioSource() { var AudioFile = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync("folk_rock.mp3"); var AudioStream = await AudioFile.OpenAsync(Windows.Storage.FileAccessMode.Read); await _cw.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => { AudioElement.SetSource(AudioStream, AudioFile.ContentType); }); }