http://bugs.winehq.org/show_bug.cgi?id=22152
--- Comment #33 from Collin Nothingmuchheretosay@yahoo.com 2012-09-30 18:10:41 CDT --- The workaround is using GC_DONT_GC=1 right before you launch the installer.
"GC_DONT_GC=1 wine launcher.exe"
I'm not sure if it's for 64bit os's specifically but it does help the installer launch. I used DFO (Dungeon Fighter Online) as the test subject.
Debian Sid x64, Wine 1.5.14