Thanks but it's not working either.
And there's nothing wrong with my Nvidia GPU, it's working as intended for all the other games. Needless to say I always keep the drivers up-to-date as well.
I have the very same problem, no matter what I do (I've tried Cynical_Scrub's advice) the game still runs on the Intel HD Graphics GPU. Fortunately, it runs smoothly enough and I only get occasional FPS drops.