VLC media player from VideoLAN will play all sorts of audio and video formats including MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg and FLV.
It is available for Windows, Mac OS, Linux and BeOS.
http://www.videolan.org/vlc/
Recent comments
Stephen said How does this compare with Notepad++?.
Becki said I've been using this for years, love it..