MPCStar

MPCStar is an application that can play next to all video formats you can see nowadays. It is a very good choice if you don't want to install programs like QuickTime or RealPlayer, because MPCStar includes the necessary codecs to play all kind of formats. MPCStar is not only a video player, but it also offers you several tools, all of them are open source, so they are free: Media Player Classic, FFDshow Codec Pack, Real Player Codecs & ActiveX Controls, QuickTime Codecs and DirectVobSub. Finally, remember that the main files that MPCStar supports are: AVI, CD, DVD, WMA, FLV, MKV, MP4, MPG, OGM, QT, RM, SWF, WMV, and more.