Running a ~600x400 game fullscreen?

Hey everyone, I got Outwars to play full screen. I found an option somewhere where is had "centre" "scale to full screen" and something else, But i dont remember where i found that option, and im trying to do it to my other game now (Monster truck madness)

I stumbled onto that option accidentally, maybe i can find it again accidentally.. lol Ill let you know.