http://bugs.winehq.org/show_bug.cgi?id=20702
--- Comment #7 from lahmbi5675@gmx.de 2012-05-13 06:12:07 CDT --- Hi Bruno,
in Windows you won't be able to create directories with identical names regarding case insensitivity, Windows will prevent you from doing so. So it may be legitimate for Windows apps to rely on file/directorynames being some kind of unique. I'm not sure, how this issue could be resolved, maybe wine would have to intercept when seeing 'identical' filenames, too, somehow renaming them, which maybe some kind of overkill.