Steam (using wine) starting civ 5 on the wrong screen

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http://askubuntu.com – I have my left screen set as primary screen in ubuntu (unity) and most things just do what they are supposed to do when they are fullscreen. They run on my primary screen. But for some reason when I launch civ 5 from steam (using wine, not the new beta) it fullscreens to my second (smaller) screen. How can I make this game appear fullscreen on my primarry screen? I am using the fglrx-updates driver that ubuntu provides. (HowTos)