Hey,
See bug 21809 (http://bugs.winehq.org/show_bug.cgi?id=21809).
If you really need this fixed, you will have to recompile wine with the patch
(possibly sync it with current git too...). Otherwise, best course of action is
hope it doesn't go live.
Note, on some setups (Fedora apparently), just setting wldap32.dll to native
fixes the issue. To try that, you will need a wldap32.dll from windows in your
WoW folder, and set "wldap32" to native in winecfg. I can't
guarantee this will work; for me it didn't.