Microsoft Products
Windows Media Video 9 VCM
This download allows WMV3 (Windows Media Video 9) encoding and decoding in an AVI container. It also allows WMV3 decoding (both in ASF/WMV and AVI) on older versions of Windows (95, 98 First Edition, and NT 4).
Alternate download location that does not require validation:
[url]http://www.microsoft.com/windows/windowsmedia/download/AllDownloads.aspx[/url]
(On first drop-down menu select “Codecs Installation Packages” and on the second one pick “For Windows Media Video 9 VCM).
P.S: VCM = "Video Codec Manager"
Unknown - Video Codecs VC-1
More information [url=http://en.wikipedia.org/wiki/VC-1]here[/url]
Unknown - Video Codecs Windows Media Player
Available for Windows and Mac OSes.
Note that the Mac OS versions only play ASF/WMV/WMA files. They will not play AVI files.
Unknown - Media Players MSN Audio
Thanks to [url=http://www.moviecodec.com/scripts/userinfo.php?uid=1078]anonymous[/url] for digging this one up.
Unknown - Audio Codecs Windows Media Encoder
No description.
Unknown - Encoding Software | 
