There are kinds of media player for right now, but not all of media players that can support video in various formats. We usually use a specific media player to a video format.
Now, you do not need to do something like that again. Enough with one media player you can use it for all video formats, just download VLC player. Not only the variety of video formats that can be supported, but also a variety of audio formats such as MPEG, MP3, AAC, AC3, Vorbis, E-AC-3 (Dolby Digital Plus), DTS, WMA, FLAC, Real Audio, ALAC, Speex, MIDI, AMR and many more. VLC can also play files that are partially damaged. So, download it now and use it to wacth World Cup 2010 final.