http://bugs.winehq.org/show_bug.cgi?id=3037
--- Comment #51 from Dmitry Timoshkov dmitry@codeweavers.com 2010-05-10 03:24:28 --- (In reply to comment #50)
I have not tested as far as I'm not aware about (and have not) Windows apps at all, except for LTspice and another free app (last one has not MDI).
Regarding your question, MDI applications work in Wine, it's not clear to me from the description what kind of a problem your app has.
BTW, current bug description is misleading, as far as initially the bug included two parts in accordance with first message. Currently the second one is remaining. Is it possible to rename the bug with more corresponding and speaking to wine team manner?
Sure, it's your bug.