https://bugs.winehq.org/show_bug.cgi?id=22369
--- Comment #25 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Bruno Jesus from comment #24)
I see that your compiled application will not run in XP or lower, so I recompiled it in Vistual C++ 6. But all I see is a large gray window, no childs inside. Since the bug has no screenshots can you tell me what is supposed to happen?
Create some child/MDI windows either using File menu or hotkeys: Ctlr+N creates child window with WS_EX_MDICHILD style set, Ctrl+C creates child window without that style. Then either press Ctrl+T or menu Window -> Tile to tile created windows.