X Codec Pack (formerly XP Codec Pack) is a set of codecs and filters (including AC3Filter, RadLight APE Filter, FFDShow MPEG-4 Video Decoder, Matroska Splitter) to play the most popular audio/video formats. Unlike several other sets available on the market, X Codec Pack does not litter the system with hundreds of libraries playing media resources, but installs only the most frequently used codecs, which in 90% are sufficient for the average user. In addition to a set of codecs and filters, the package also includes a lightweight Media Player Classic media player for smooth video playback.

The big advantage of X Codec Pack is the support for all the most popular formats nowadays.