I'm not too up on the file extensions or whatever they're called. But every once in a while I want to play a video online & I already know that my ps3 doesn't support .mkv, but my pc doesn't either and I would have thought that i'd have the codecs & everything for it. I have the windows media player, vlc player & some other program that was installed on this pc, it's pretty new & runs win8, it's like a $1500 computer so id like to be able to do something with it when I want. Anyways, my questions are mostly with understanding what an .mkv is, is it same type of thing as saying an .avi or .mp4 etc? or are some mp4's coded with this .mkv stuff also. That plus it'd be nice to know whats so special about it, a quick search online (wiki, answers etc) says that there's probably not gonna be a factory installed program that plays it, so what's the point? why not just make it an .avi or something that everybody can play? Does it circumvent the cinavia crap on blurays or something?