How to play .ogm files (and other video)  (by Stigma)

Admin Note:
The following guide is obsolete. Continue at your own risk.
Email address is dead. I recommend using CCCP instead.

Please choose how much help you need:

Beginner - I am a beginner. I need detailed step-by-step instructions

or

Expert - I am an expert. I only need basic short instructions.

or

Troubleshooting - I have installed like the guide said, but i have a problem

The guides should work for all versions of windows. Tested with
WinXP, Win2000 and WinMe.