http://bugs.winehq.org/show_bug.cgi?id=11861
--- Comment #9 from Mikolaj Zalewski mikolaj.zalewski@gmail.com 2008-04-02 09:47:57 --- A patch to fix the invalid char glyph got applied to the Wine Git (http://www.winehq.org/pipermail/wine-cvs/2008-April/041978.html) so now they should display correctly correctly as empty squares.