You can try this codec but I have never had occasion to try it so there are no guarantees.
http://www.freesoft.cc/dl.asp?id=55231 Regarding conversion to other formats, you will need to be able to play it to convert it
MP42 - Mpeg4v2 is an old Microsoft Windows Video format.
Flip4Mac Player can play it. Flip4Mac Player Pro will allow you to save it as mov (Quicktime) or export/convert to another format from QuicktimePro.
VLC and mPlayer can both playback MP42 video. ffmpegX can reencode to another video type. All three are free and you can find them via macupdate.com or versiontracker.com
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
MP42 Codec
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.