This is not very useful, it only tricks the game installer in to believing that you have a better video card than what you actually have. This will only let you install a game which otherwise won’t even install. But it will NOT improve your gaming performance in any way.
I don’t see much of a point in an application like this. If your PC doesn’t meet the minimum requirements of a game, then there is no point in trying to play it

, it will be extremely slow (that is why there is a minimum requirement spec in the first place)