If you have some WMV video files you only need the audio but no video, you can compromise by extract audio from it and then listen to it. You might want to extract the episode or the audio of a movie for playback on your iPod, as ringtones for iPhone, or to create your own masterpiece in Garageband. The question is: how to convert WMV to MP3 for iTunes or Garageband?
If you already have QuickTime(Pro), and you are able to play the .wmv file in QuickTime (Pro), you can use file/Export-->'Sound to wave' or 'Sound to aiff' to extract the audio track. After that, import the audio track into iTunes and you can convert it to MP3 format. Make sure that you install Flip4Mac or you won't be able to play WMV files (DRM WMV file excluded).Read more »