Too drunk to put forth the effort...
I think it's
www.videolan.org but if that's not it then do a google for VLC media player... seriously it owns all players hands down. Simple interface, plays EVERYTHING, and subtitles are a breeze to have showing if they are available. I can't say enough about this program, it's abilities and it's near perfection. It's only downside is that it does take up more memory than WMP when you play something. Not much, but some. It makes a difference at work (a difference I ignore because of it's quality).