And if it was a simple program, I wouldn't worry. But I'm not sure how well e.g. Mac graphics cards play with Windows-only code. They will be optimised to run OpenGL, not DirectX. Same with a half-dozen other subsystems that may be able to interpret windows instructions, but may lack the edge to make a high-performance game work smoothly.
On the other hand, I stopped paying attention to those things years ago. For all I know, those issues are irrelevant now. Thus why I'm not sure - and why I'm glad SamBurke can test the demo before shelling out $60 on the game.
GW