Most AVI, MKV, OGM and MP4 movies can be played. The contents can be installed at once with the latest version of ffdshow, Windows Media 9 VCM, MPV (MPEG 2) Decoder, CoreWavPack, Haali Media Splitter, ...
Codec packs are usually a terrible idea and cause way more problems than they solve, but CCCP is just stuff that I would install manually, and is very unlikely to cause any conflicts.
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