http://bugs.winehq.org/show_bug.cgi?id=23180
--- Comment #23 from Dmitry Timoshkov dmitry@codeweavers.com 2010-07-10 10:49:40 --- (In reply to comment #22)
Unfortunately, no. At first, I thought it did, but it looks like something weird is going on with this game and KWin. The first time I ran it with the patch, everything looked fine. But the second time, the close button disappeared again. Some further testing shows that the close button is visible sometimes, and missing sometimes, regardless of whether I have that patch applied...
These all very much sounds like a KWin bug. Close button works as expected for me under Gnome.