The game has a launcher which works on first run but I couldn't work out how to make it appear on subsequent runs, other than reinstalling the game. This launcher lets you pick between Direct3D and OpenGL, as well as DirectInput. I tested both Direct3D and OpenGL and both worked fine, I found them indistinguishable. I tested "DirectInput 8" as input option which also works fine, I did not test DirectInput 5.