The name "Ogg" refers to the file format which can multiplex a number of separate independent free and open source codecs for audio, video and text (such as subtitles). Files ending in the .ogg extension may be of any Ogg media filetype. The term "ogg" is often used to refer to audio file format Ogg Vorbis, that is, Vorbis-encoded audio in the Ogg container.
You can use VLC player to play ogg files under Windows XP or Vista.
1. Visit VLC site to download VLC player
2. Save the file on your desktop.
3. Next double click the VLC file to install VLC on Windows computer.
4. When the install options present themselves, make sure that the "Install Firefox Plugin" is selected so that you can view streaming media in Ogg format while browsing the web.
5. After the install completes, restart Firefox.
6. If you see video and hear audio it is working.