Sounds plausible. Reading a bit up on window classes on MSDN (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windowclasses/aboutwindow.asp) indicates that overrideability of the default system classes is actually intended.
Hmm, for fun I just tried to simply re-register a standard control class on Wine, didn't work. I wonder if there's another way to replace/enhance a default class, preferably one that doesn't require arcane hooking or similar.
-f.r.
