http://bugs.winehq.org/show_bug.cgi?id=19436
--- Comment #6 from Henry Kroll nospam@thenerdshow.com 2010-03-06 05:40:05 --- Same error in wine-1.1.40
It makes sense that the window is never closed. As mentioned in http://www.winehq.org/docs/winedev-guide/dcom-1, "The threads started by our implementation of DCOM are never terminated, they just hang around until the process dies."
Some work began on this back in 2005 http://www.winehq.org/pipermail/wine-devel/2005-November/041884.html
The bug seems to be related to this fixme message that pops up at around the same time the spell window is brought up: fixme:menu:GetSystemMenu not supported on other process window 0x1005e
So how do we get the SystemMenu from another process? FindWindow?