...Or you can use GS-Startup Manager to provide a setup panel for your game so that the user can select the resolution before they use the game, just as in Max Payne, Hitman, Tomb Raider etc. Eg:



GS-Startup Manager 2.0 (freeware) will be released later this month, keep an eye on User Contributions... (Never hurts to plug your program. )

Cheers,
Keith