MediaInfo Portable Collects and displays technical information about media files.
ADVANCED Codecs Frequently updated high definition video codecs for Windows, resolves the issue of 'video not supported' with the most popular and used audio and video codec packages.
K-Lite Codec Pack Full Comprehensive selection of video codecs which allow for the playback of most types of video files found on the web including DivX, XviD, MKV, MusePack DirectShow.