The K-Lite Codec Pack is a collection of codecs and related tools. Codec is short for Compressor-Decompressor. Codecs are needed for encoding and decoding (playing) audio and video. The K-Lite Codec Pack is designed as a user-friendly solution for playing all your movie files. With the K-Lite Codec Pack you should be able to play all the popular movie formats and even some rare formats.


Changes in 2.78:

* Updated Media Player Classic (latest build from Celtic_Druid)
* Updated ffdshow to revision 479
* Updated DivX decoder to version 6.2.5.34
* If you have stability issues with the DivX decoder, then don't install it or disable it via the Codec Tweak Tool and use ffdshow instead.
* Updated DivX encoder to version 6.4.0.51
* Updated AC3Filter to version 1.11
* Updated x264 VFW to rev. 578
* Updated Haali Media Splitter to version 1.6.338.23
* Updated Cyberlink MPEG decoder to version 6.0.0.3402
* Updated Cyberlink MPEG demuxer to version 1.0.0.4528
* Updated FLAC to version 0.73.1936
* Updated LAME MP3 ACM to version 3.97
* Updated LameDropXPd to version 3.97
* Updated LAME CLI to version 3.97
* Updated OggDropXPd to version 1.8.9 aoTuVb5
* Updated DirectVobSub. This should fix a (rare) problem with green lines on some divx files.
* Updated GSpot to version 2.60 beta 2
* Added .asf file association option
* MPC will now play 3GP files using DirectShow filters (MP4 splitter + ffdshow) instead of QuickTime.
* Added option to create a System Restore Point at start of installation.
* Improved compatibility with Windows Vista

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Source: betanews