http://bugs.winehq.org/show_bug.cgi?id=20643
--- Comment #21 from Dmitry Timoshkov dmitry@codeweavers.com 2009-12-04 01:14:59 --- (In reply to comment #20)
I have a Windows XP OS, and Launcher just resets an ACL for WoW folder to be Users:(OICI)F, it even doesn't change the owner. So it's definitely a Wine bug.
There was a report that the WoW Launcher.exe breaks the directiry permissions for a user without Administator priviledges set under Vista. Comments in this bug report confirm this. So this is not a Wine bug.