Originally Posted by Yaboze
Yeah, about 10-12 years ago, half the games on my PC used OpenGL, now Rage will be the only one.
The point is, it doesn't require an OS upgrade, to answer your question why it's on XP. The last game that use OpenGL was ET: Quake Wars. idsoftware decided to stick with OpenGL and good for them because it's not limited to Windows versions.