K-Lite Codec Pack 64-bit Edition 2.9.4 for Windows 7, Windows Vista, Windows XP
The K-Lite Codec Pack 64-bit Edition is a free collection of codecs and related tools. Codec is short for Compressor-decompressor. Codecs are needed for encoding and decoding (playing) audio and video. The very user-friendly installation is fully customizable, which means that you can install only those components that you want.
The K-Lite Codec Pack 64-bit Edition contains a couple of 64-bit DirectShow filters. These filters can be used to play the most common types of video files in 64-bit media players. This 64-bit Edition works on the 64-bit Editions of Windows XP, 2003, Vista, 2008 and 7.
64-bit applications can only use 64-bit codecs and filters and 32-bit applications can only use 32-bit codecs and filters, so this 64-bit Edition can only be used together with 64-bit media players. At the moment only a few of those exist, an example is Windows Vista Media Center. Most players are still 32-bit. Even the 64-bit Editions of Windows still use a 32-bit version of Windows Media Player by default. For 32-bit players you should use the normal K-Lite (Mega) Codec Pack. You can have both this 64-bit Edition and the normal 32-bit K-Lite (Mega) Codec Pack installed at the same time. Both will function independently from each other.