http://bugs.winehq.org/show_bug.cgi?id=19011
--- Comment #4 from Dmitry Timoshkov dmitry@codeweavers.com 2009-06-20 11:46:37 --- It's absolutely not clear why Mono throws an exception.
fixme:ntdll:find_reg_tz_info Can't find matching timezone information in the registry for bias -120, std (d/m/y): 27/09/2009, dlt (d/m/y): 27/03/2009
If the fixme above doesn't go away with clean ~/.wine that means that your distro provides old/broken time zone information, and Wine can't find a match in the registry. Anyway, Wine provides correct time zone information even in that case. I'd suggest to ask Mono developers about that exception.