.ogg files

[Tsunami]

Dick's guide -->> http://www.ckyforums.com/index.php?showtopic=4096

[infiniter]

Winamp isn't a good example since it is mainly a music player.
It can play movies, but in this feature it sucks.

Better use a standard player like WMP or Zoomplayer. You only need to install OGG Direct Show filters.