Advanced Vista Codec Package is a freeware mega codec package for Windows Vista Release candidate 2 similiar to the K Lite Mega Codec package.
This package does not contain a media player nor does it associate filetypes. With this package installed, you can use any media player (including Windows Media Player 11) to play DVDs, movies, audio and video formats such as quicktime, realmedia, avi, mpeg, Flv, swf, wmv, etc. Streaming video can be played within web browsers.

This codec package features some of the best known codecs/filters like:

Quicktime
RealMedia/Realaudio
Shockwave Flash
Microsoft Windows Media Audio/Video
FLV Decoder/Splitter
OGG/MP3
WinAmp/Shoutcast
VMware Movie decoder
WavPack Splitter/Decoder
Video filters like InterVideo, AVI and MPEG
And more………..

Download Link(38Mb)- http://fileforum.betanews.com/sendfile/1159994557/1/fcpack414_setup.exe