HaloMods "Classic" Read-only Archive

ok- im tryin to make a prgram that will benefit the halo/halo 2 modding community. what i need to know, (IN VB CODE!) is how i could make a program that could just browes for a .map file, but keep it selected in the viewport on the program, then have u hit a ratio button, and have it open that with ...

what? i got DEV-C++ and it says it needs the make file thing, where do i get that? and where do i put it. post links please!