http://bugs.winehq.org/show_bug.cgi?id=30104
--- Comment #10 from Nikolay Sivov bunglehead@gmail.com --- (In reply to Alistair Leslie-Hughes from comment #9)
Created attachment 48255 [details] Log file
Here is a log file with the uxtheme being logged.
It doesn't mean anything so far. Did you try native uxtheme?