Yeah and Windows 7.
Silly of them, people with slow net connections might be a bit peeved with the fact they have to download 1GB to get hi-res textures :P
And I just found something else out. The min requirements for HDD space, listed on the case, is 7gigs, that's no problem. When I install the game, it says 5.5 gigs!! So that means, the download finishes the total for the package stated install. I think that's a bit dubious as they really had to short-change this game. I will find out within about 5 hours of playing it.