I have a video/audio clip (call that file 1).  I need to extract the audio only, edit that audio file and then add the edited audio file to a different video clip.  In Movie Maker I easily saved the audio portion of file 1 as a .wma file.  Then I attempted to bring the exact same .wma file back into Movie Maker and it says "Movie Maker doesn't support the selected file type."  WTH???  Movie Maker does not support a file type created BY Movie Maker?  I'm very confused.  Any suggestions would be most appreciated.