The superset of win32 codecs for mplayer
includes support for a lot of different movie types including

- Inter Video 3.2, 4.1
- MPEG-4 v1,v2,v3 (DivX :-))
- Cinepack Video
- WMA Audio, MPEG-Layer 1,2,3, GSM6.1

and much more.

This compilation of codecs is provided by the makers of mplayer.

WWW: http://mplayer.sourceforge.net