http://bugs.winehq.org/show_bug.cgi?id=25205
--- Comment #12 from Marcus Meissner marcus@jet.franken.de 2010-11-21 18:53:46 CST --- $ grep arch= ~/.wine/system.reg #arch=win64
would be a 64bit prefix. win32 would be a 32bit prefix.
(replace .wine with your WINEPREFIX)
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