title: How to get the rating tag of a .m4a file in C#
body: <p>I work with TagLib# to get the ratings of my .mp3 files this part is working so far, but I have absolutely no idea how to get the rating of a m4a file. </p>
  
  <p>This is how i get the rating of a .mp3 file, but it doesn't work for m4a:</p>
  
  <pre><code>TagLib.File file = TagLib.File.Create(Dateipfad);
  Tag tag = file.GetTag(TagLib.TagTypes.Id3v2);
  TagLib.Id3v2.PopularimeterFrame rating = TagLib.Id3v2.PopularimeterFrame.Get((TagLib.Id3v2.Tag)tag, "Windows Media Player 9 Series", true);
  byte rate = rating.Rating;
  </code></pre>
  
  <p>How can I get the rating of an m4a file?</p>