[dismalaf]

No, they're on Windows because it was the only viable gaming desktop environment during the 90's and 00's. Apple was all but dead and hardware was limited, Linux was in its infancy, Unix vendors didn't care about normal desktop users, etc...

In the early days of 3D gaming, there were studios that used OpenGL over DirectX on Windows. ID Software were the best known example of choosing OpenGL over DirectX.

[thefz]

Of course excellent OpenGL products exist (ID software is the worst example because they were... geniuses), but from the developer point of view, DirectX was the full package.