Installation instructions:

It is highly recommended to first uninstall all existing codec related packages before installing this package. This way your system stays clean and potential problems will be avoided. You can remove them in Start Menu > Settings > Control Panel > Add/Remove Programs (Software).

Features & Notes:

Media Player Classic [version 6.4.8.2]
This is a full-featured player. Has internal decoding support for DVD, MPEG-2, DTS, Matroska, OGM and some other formats. It plays QuickTime and RealMedia (if those codecs are installed).

DivX Pro [version 5.2.1] [Decoding]
This is required for playing DivX movies. DivX is the second most popular format.
XviD [version 1.0.3 build 2004-12-20] [Decoding]
This is required for playing XviD movies. XviD is currently the most popular format.
3ivX Pro [version D4 4.5.1] [Decoding]
This is required for playing 3ivX movies. Also supports various other MPEG-4 variants.
Required for opening audio and video streams in a MP4 container (.mp4 files).
Windows Media 9 VCM [version 9.0.1.369]
This is required for playing movies and audio that are in the Windows Media 9 format.

Fraunhofer MP3 DirectShow decoder [version 1.9.0.311]
Required for playing movies that have a MP3 audio stream.
AC3 DirectShow decoder [version 0.70b mod]
Required for playing movies that have an AC3 audio stream.
Vorbis DirectShow decoder (CoreVorbis) [version 1.0]
Required for playing movies that have a Vorbis audio stream.
AAC DirectShow decoder (CoreAAC) [version 1.0b9]
Required for playing movies that have an AAC audio stream.
Not required if you install the 3ivx AAC decoder.
3ivX Pro [version D4 4.5.1] [Decoding]
Required for playing movies that have an AAC audio stream.
Not required if you install CoreAAC.

DirectVobSub (vsfilter) [version 2.33]
DirectVobSub is a tool for displaying subtitles. Your subtitle file should have the same filename as your video file (for example Movie.avi and Movie.sub) and should be in the same folder as your video file. Then the subtitles will automatically be displayed in most players.
Matrix Mixer [version 0.30b]
Matrix Mixer can be used to amplify the sound of a video file. It also can mix stereo sound to multiple channels (useful for 4.1 and higher speaker sets).

GSpot Codec Information Appliance [version 2.52 beta 1 build 2004-09-15]
GSpot is a tool that can tell you exactly which codecs are needed to play a certain video file. This is very helpful when you have troubles playing a video file.