http://bugs.winehq.org/show_bug.cgi?id=10767
--- Comment #31 from Dmitry Timoshkov dmitry@codeweavers.com 2010-08-01 01:44:42 --- (In reply to comment #29)
Seriously, ASCII '.' = 0x2E, ASCII '_' = 0x5F. Is it that hard to figure out?
Feel free to file a bug at unicode.org