http://bugs.winehq.org/show_bug.cgi?id=11773
--- Comment #14 from Ruslan b7.10110111@gmail.com 2011-12-19 10:18:58 CST --- This bug is still present as of 1.3.35.
Changing font as per comment 12 no longer works around this.
I was wrong here - this does work, but taking following into account" It appears that any *Monospace* font has this problem (with fractions, in particular). The examples are: Bitstream Vera Sans Mono, DejaVu Sans Mono, Courier{, New}, Free Mono.