Is PC gaming part of the MS ecosystem?

[psrock]

VGhippy said:
Well Microsoft does produce a lot of PC games, like Age of Empires, Mechwarrior and Microsoft Flight, and they do have Games for Windows Live exclusive to several games like the Arkham Asylum/City series so you have to use it just to play them (even if you buy them on Steam). Obviously the entirety of PC gaming is not part of the MS ecosystem, but they are still reasonably large players.

Games for Windows is  really small part of PC gaming unless proven otherwise. Even Sony makes PC games.