The VLC Codec Pack is a simple to install package of decoding codecs used for playing back music and movie files. After installation you will be able to play 99.9% of files in Windows Media Player or any other DirectShow enabled player. Simply install this pack and double click on the file you wish to play. Windows Vista and higher users also have the added benefit of basic playback of BluRay when using Slysofts AnyDVD HD.