MP4 codec for Media PLayer Classic?

[Formula1]

My some one please tell me how i can get media player classic to to play MP4 (mpeg-4 files)?

[Jasime]

MP4 is just a container, like avi, mkv and ogm. It can hold audio and/or video.
The most common audio codec packed in mp4 files is ACC.
The most common video would be H264 og X264 (apples codec and the free alt.) to decode/play these files, have a look at http://x264.nl/ under decoders (just scroll a bit)