There are many mpeg codec
a cdoec is a decompressor which allows the media players to play the
encoded fiels of mpeg avi et al.
I can't tell you which codec are involved.
http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=mpeg+codec+xp
http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=mpeg+codec&btnG=Google+Search
an example.
http://www.divx-digest.com/software/divxcodec.html
Program : DivX Codec
Author : Official site
Version : 3.11 Alpha
OS : Windows 9x/Me/2000
Date : 21 May 2001
Size : 700 KB
Link : 1. Version 3.11 Alpha - Mirror Link 1
2. Version 3.11 Alpha - Mirror Link 2
3. Version 3.11 Alpha - Mirror Link 3 - Australia
4. DivX Scene Detect Patch
5. Vulture DivX patch
6. DivX Audio Compressor - see note
7. DivX Codec 4.x
8. DivX Codec 5.x
Make a check point and try a codec set, if it doesn't work
do a restore and try another.
Hemlock