diff --git a/TwitchDownloaderWPF/PageVodDownload.xaml.cs b/TwitchDownloaderWPF/PageVodDownload.xaml.cs
index 802fdf53..9de33ad4 100644
--- a/TwitchDownloaderWPF/PageVodDownload.xaml.cs
+++ b/TwitchDownloaderWPF/PageVodDownload.xaml.cs
@@ -412,7 +412,7 @@ private async void SplitBtnDownloader_Click(object sender, RoutedEventArgs e)
                 FileName = FilenameService.GetFilename(Settings.Default.TemplateVod, textTitle.Text, currentVideoId.ToString(), currentVideoTime, textStreamer.Text,
                     checkStart.IsChecked == true ? new TimeSpan((int)numStartHour.Value, (int)numStartMinute.Value, (int)numStartSecond.Value) : TimeSpan.Zero,
                     checkEnd.IsChecked == true ? new TimeSpan((int)numEndHour.Value, (int)numEndMinute.Value, (int)numEndSecond.Value) : vodLength,
-                    viewCount, game) + ".mp4"
+                    viewCount, game) + (comboQuality.Text.Contains("Audio", StringComparison.OrdinalIgnoreCase) ? ".m4a" : ".mp4")
             };
             if (saveFileDialog.ShowDialog() == false)
             {