It's a horrifying fact, but sometimes people use the Windows 8 app store. Doing so is like plunging your arm into a toilet full of month old sewage in the hope of pulling out a diamond. Sure, there's a chance you won't emerge with a handful of unprocessed waste, but why would you ever take the risk?
Unfortunately, and much like various mobile app stores, the site is a breeding ground for scam versions of games. For instance, Darkest Dungeon designer Tyler Sigman warned on Twitter (opens in new tab) about an illegally sold version of the game.
If anyone has a contact at Windows Game Store, please share. Somebody is scamming DD by selling it (illegally) on there. February 22, 2015
Sigman follows by saying that if a player's copy of the game didn't come from the Steam or Humble Store, "you got scammed". The Windows store listing, incidentally, is for a 2MB download. Probably not an actual game, then.
Darkest Dungeon is by no means the only game being illegally sold on the store. The same "developer" has listed a copy of Lego Batman 3 (also 2MB), and SCS's Tomáš Duda points out multiple fake versions (opens in new tab) of Euro Truck Simulator 2.