http://bugs.winehq.org/show_bug.cgi?id=16059
--- Comment #6 from Kevin Meyer billy65bob@gmail.com 2008-11-18 04:53:52 --- I intend to vote this down, based on a topic on bethesda's forum. Windows users are experiencing this problem as well, which makes this bug report pointless, as the code correctly imitates windows! now if I could only find that topic on the forum...
in any case the best solution if you intend to alt-tab is to run it windowed, nuff said :P