Most MPEG-2 codecs are hard to find by themselves, as nowadays most people just download codec packs and don't bother with individual codecs. You can download such a codec pack and then extract the ones that interest you.
The latest K-Lite pack contains two MPEG-2 codecs:
- MPEG-2 (Cyberlink) [version 22.214.171.124]
- MPEG-2 (Gabest) [version 126.96.36.199]
If you want a very complete codec pack, use the K-Lite Mega Codec Pack.
It is the K-Lite variant with the most codecs. However, as far as MPEG-2 codecs are concerned, only these two codecs are included in all K-Lite versions.
To find a codec's filename, you can use InstalledCodec :
InstalledCodec is a small utility
displays the list of all Codec drivers
and DirectShow filters currently
installed on your system. For each
component the following information is
displayed: Display Name, Type,
Disabled Status, Installed/Modified
Time, Description, Company Name,
Filename, and more...
Installing a codec is normally only a matter of copying it to its place (normally system32) and issuing regsvr32 on it. See this guide:
How to install/uninstall DLL and AX codec/filter files