Combined Community Codec Pack
Combined Community Codec Pack, also known as CCCP is a really complete codec pack which will allow you to play and convert any kind of video files.
Once you'll have downloaded and installed CCCP you will have no video format problems anymore.
AVI, MPG, MOV, FLV,... they are just the most famous but when you'll have CCCP in your system you will not remember the video format because you will have no problems when playing any video your friends send you.
CCCP is a DirectShow filter pack tat will solve your video playback restrictions.
The program inclues a toolbar for Internet Explorer whose installation is optional.
In addition to the Standard version, an Advanced version exists where you can encode any file that you have created or created in a particular format.