If you haven't tried it, download VideoLan Client, or VLC. It's free, open-source, and plays TONS of different formats/codecs. And, it wasn't built by MicroSuck.
Also, theck out http://www.macupdate.com/info.php/id/17787 for a WMV plugin for quicktime.
Also, theck out http://www.macupdate.com/info.php/id/17787 for a WMV plugin for quicktime.