http://bugs.winehq.org/show_bug.cgi?id=30849
--- Comment #54 from Erich Hoover ehoover@mines.edu 2012-06-07 09:34:03 CDT --- (In reply to comment #52)
I'd expect it would also get 4Gb of address space on 64-bit Windows, so there must be something else going on here. Are you using a 32-bit or 64-bit wine prefix?
I'm using a 32-bit prefix on a 64-bit kernel.