X Codec Pack is not just another codec pack.
Just the most used (popular) codecs are included (see below). If you are looking for a big pack with lots of codecs, filters, tools, this is the wrong place. Lots of codecs can mess up your Windows.
Unlike other codec packs, you can select the components you want to install, you get uninstall support, detection for previous installed versions, update for new versions - you dont have to download the whole pack again.
Features:
DivX codec
XviD codec
AC3 filter
DivX AntiFreeze
DirectVobSub (VSFilter)
DivX G400
Video Inspector
Media Player Classic
What's New in version 2.2.0 Build 514:
corrected bug involving compenents for uninstall not showing
update system recoded, better handling, v0.9.1
install and uninstall script upgrades and fixes
if user selected no shortcuts, uninstall did not work correctly
DivX G400 shortcut was not deleted at uninstall
updated script for Windows version detection
disabled MPC AC3/DTS internal filters
bug involving VI shell extension
updated script for silent installs
added icons for Vista
updated XviD to v1.1.3
updated the answer file creator for unattended installs, now included in the pack, v0.3.2
create shortcuts for all users used, not an option anymore
AC3 filter updated to v1.46
MPC updated to HC v1.1.0.0
DivX v6 updated to v6.8.2.9
Video Inspector updated to v1.12.0.112
VSFilter updated to v2.38, config shortcut available
added/updated FFDShow BETA 4a (rev 1723)
option at uninstall for keeping/removing all/registry/files/settings
if already installed, read selected sections from registry