http://bugs.winehq.org/show_bug.cgi?id=21036
--- Comment #21 from Mostafa m.ghadam@gmail.com 2009-12-19 22:50:52 --- (In reply to comment #20)
Native usp10.dll works around the bug.
I have copied my native usp10.dll , gdi32.dll, user32.dll from my windows with persian language to /root/.wine/drive_c/windows/system32/ but still have the problem and nothing has been changed. I still copied usp10.dll to firefox folder and it does not work too.