From Codec Guide:
Full supports even more audio and video formats. It also has encoding support for various formats. This package is for power users and people who do video editing/encoding.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.
What's new in this version:
Version 6.7 updates Media Player Classic Home Cinema and ffdshow.