includes :
AC3Filter 1.63b
AVI Splitter 1.0.0.9
CDXA Reader 1.0.0.2
CoreAAC (AAC DirectShow Decoder) 1.2.0
CoreFlac Decoder 0.4
FFDShow MPEG-4 Video Decoder 2008.12.19
GPL MPEG-1/2 Decoder 0.1.2.0
Matroska Splitter 1.0.3.0
Media Player Classic 6.4.9.1
OggSplitter/CoreVorbis 1.1.0.79
RealMedia Splitter 1.0.1.2
RadLight MPC Filter 1.0.0.4
RadLight APE Filter 1.0.0.4
RadLight OFR Filter 1.0.0.4
RadLight TTA Filter 1.0.0.2
The Codec Detective 2.0
VSFilter (DirectVobSub) 2.39

Features of XP Codec Pack :
clean & compact
no spyware / adware / viruses included
easy to install / uninstall
easy to use
100% legal