http://bugs.winehq.org/show_bug.cgi?id=32126
--- Comment #5 from Bartosz gang65@poczta.onet.pl 2013-06-20 06:00:23 CDT --- Hi Robert.
Try to delete ~/.wine directory, and proceed the MathCad 14 installation again.
I have fixed mlang.dll, so use original mlang.dll. After patch this library, the strings should be formatted correctly.