MPEG-4 (MP42) info
Apparently one of several different and incompatible MPEG-4 codecs. Rumour has it that this codec is downloadable from the Microsoft site somewhere. This codec is distributed as part of Microsoft Windows Media Tools 4. Includes quality improvements over the earlier MPG4.
Download as part of “Windows Media Codecs 8.0 for IT Professionals.”
Angel Potion MPEG-4 Codec