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I have Windows 7 and it is x64
I found out a way (for me) to open the game, go into steam folder and into beamng.drive, Then try bin32 and open that EXE file or the bin64...
After i installed the 0.3.8.1 update I can't manage to start my game trough Steam, I even reinstalled the game to test that, but that didn't work....