http://bugs.winehq.org/show_bug.cgi?id=30849
--- Comment #62 from Jason Parker north@ntbox.com 2012-06-07 12:57:55 CDT --- (In reply to comment #61)
I grabbed that from the i386 value for user_space_limit.
Strange. There may be some buffer that would need to be accounted for in the 3GB case then - that, or the existing value was just wrong.