It would be quite easy to build a loader actually, now that I think about it.
If you have Visual Basic, and if the game comes with a installer you could simply ask the user to specify the games folder.
Usually C:\Program Files\Company name\game name\GAME.exe")
So if you had a RUN game function inside the loader you could use this bit of code to open up the exe.
shell ("C:Program Files\Company Name\Game name\FPSC-GAME.exe")
Or if you are making the user specify where the game is located in a text field you could:
Hopefully this helps
DevilMouse Developments Lead Designer/Programmer/Developer