vlc viewer
It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.Now VLC media player's highest version is version 1.0.0. It supports Windows(This lastest version just can be supported by windows2000 or later), MAC, Linux.
VLC media viewer allows users to view many formats of vedio. Installation is quite easy. You just need to click several times. The rpm exists on rpm.pbone.net and on their website. And it works very well.
The related media viewer for Windows:MagicMedia
QuickView Pro for DOS personal use
Multimedia Xplorer
The related media viewer for MAC:
WMF Viewer for Mac
RealPlayer for MAC
Apple QuickTime