http://bugs.winehq.org/show_bug.cgi?id=1719
--- Comment #20 from Dylan Smith dylan.ah.smith@gmail.com 2010-06-19 21:29:14 --- I tested the same behaviour on the top level window for winefile, and found that it forced the size the same way as for the MDI window. It also set the position of the window to -32000,-32000 but that is likely a result of the task bar being used since windows 95.
Also note that icons with transparency don't seem to have their background being erased before being drawn. Of course this is the scrambled window effect that was pointed out, which my previous patch does not address.