How does GW2 works in Steam?
Don’t worry, the only thing that will happen is that the Steam Overlay will be run alongside the game. It doesn’t touch the game’s executable. It’ll eat up some of your RAM, but as far as network goes, if you have Steam on anyway then it shouldn’t use much if any more than Steam was already using.
Nah, steam won’t do anything other then provide an overlay when you press shift + tab and taking screenshots. I use steam to launch all of my games, including Guild Wars 2 so my friends see what I’m playing.
Like said earlier,
Running a non steam game through steam only starts the overlay, nothinelse. Obviously it could crash, but it does nothing to the game.