Release 0.8.6 of the VideoLAN client media player supports Windows Media Video 9
VLC (initially VideoLAN Client) is a highly portable multi-platformmultimedia player for various audio and video formats.
It can be used to display video on the computer under allGNU/Linux flavours, all BSD flavours, Windows, Mac OS X, BeOS, Solaris,QNX, Familiar Linux...

VLC Hompage: http://www.videolan.org/vlc/