Open file dialog windows how to?

Hi, i have to open a file in a standard opengl program written in c, the problem is not about how to open and handler, but i would open it using the standard open windows dialog (assuming M$ OS).
Probably i have to switch to win32 project?
Hope no! anyway anybody can help me?

thanks a lot

Check out the OPENFILENAME struct and the GetOpenFileName function on MSDN