Codec Pack for Windows 7
Windows Media Player 12, in Windows 7, now supports DivX, XviD and MP4 video files, but in case you still have problems playing any file, you can try this codecs pack, specially for Windows 7.
Win7Codecs is a comprehensive package of codecs for Windows 7. It is like a plug and play package that will play all media files on WMP, right after installation!
K-Lite Codec Pack – Complete Codec Solution
K-Lite Codec Pack is a collection of VFW/ACM codecs, DirectShow filters and tools that comes in three different packs. Codecs and DirectShow filters are needed for encoding and decoding (playing) audio and video formats. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your audio and movie files. With the K-Lite Codec Pack you should be able to play all the popular audio and video formats and even several less common formats.
