Trotskygrad: I don't know, maybe because it's new OS.
there's something called backwards compatibility
just because it doesn't exist on (most) consoles doesn't mean it doesn't exist on PC
but yeah, the majority of applications that work on an older windows OS run on a newer windows OS. It's the newer applications that have issues running on older OS.
Having used windows since windows 95 that's my experience.
The only problems I've had with win8 and games so far were problems with fullscreen and Bluescreens. As long as you run cs2d ober the desktop there shouldn't be any problems.