It seems from some digging, that the Windows 10 store version is a joke. It will not run exclusive fullscreen which for xfire and AMD in general is very bad. It runs absolutely, completely terribly for me.
Not only that but Windows 10 store sticks everything in an app folder, one I can't find a way to access. I've seen picks of a config tool I presume is in the installation folder but I can't use or see it, nor config files, not sure where saves are.
With xfire it's now unplayable as xfire does appear to be 'working' in windowed borderless(not sure if it used to or is supposed to), in as much as with xfire enabled the game is a completely unplayable mess that even the loading screens get weird. It appears to stick while loading unless I alt tab a few times at which it starts loading, in game is a stutter fest of awfulness.
Pre xfire driver where xfire simply didn't work it was far more playable. The store version, lack of access and inability to run properly full screen is insane.
£6 wasted as it stands, unbelievable they'll sell you a game but it doesn't have the basic standard gaming feature of running fullscreen. First and only time I've used the Windows 10 store, last as well.