This utility is cool as hell. With it, one can force various games into using antialiasing, working with SLI, anisotropic filtering and a host of other graphical goodness. (even if the game doesn't support it) It comes with profiles for lots of games but you can tweak those or add new ones.
I've only scratched the surface but if you like to tinker, give this a try. And if anyone tries it on an older game like Mech, let me know how it does.
http://www.nhancer.com/
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