http://bugs.winehq.org/show_bug.cgi?id=20377
--- Comment #5 from Dmitry Timoshkov dmitry@codeweavers.com 2009-11-24 02:28:28 --- (In reply to comment #4)
Actually, it would be closer to having no effect. Ken Thomases on the mailing list told me that, in the call to setenv(), the third parameter is set to FALSE so that any existing LANG variable isn't clobbered.
If you set LANG before running Wine does the locale returned by Mac framework match it? +nls log would help to see that.