I only had to change the resolution in that ugly starter form that I hadn't bothered to look. I see you can also change the resolution. Now it works in my Vista x64! So I think I'll upload it too.
This was programmed for the first or second version of DirectX and, except that it allows resolutions that aren't even supported any longer, it still works as intended. Amazing backwards compatibility. By the way...
PS: Bill Gates sucks at Doom...