http://bugs.winehq.org/show_bug.cgi?id=2841
--- Comment #29 from Dmitry Timoshkov dmitry@codeweavers.com 2009-03-04 01:12:59 --- You may try to disable the WM decorations in winecfg, that's a different thing from disable WM control on Wine windows.
And alternative is to patch Wine (with the suggested patch) to disable broken _NET_WM_WINDOW_TYPE_DIALOG style altogether. Damjan, could you please send that patch to wine-patches? I think it falls under the same rules as _NET_WM_WINDOW_TYPE_UTILITY disabled earlier.