http://bugs.winehq.org/show_bug.cgi?id=31595
--- Comment #11 from Andrew Eikum aeikum@codeweavers.com 2012-09-05 11:29:44 CDT --- The c0000409 STATUS_STACK_BUFFER_OVERRUN error is the error we've been dealing with.
It sounds like we're on the right track, but I feel like things are getting pretty unclean at this point. We should try resetting to a baseline.
I would suggest resetting and cleaning your Wine tree to match the latest wine-git, do a build with the switches, and re-install Steam into a new wineprefix. You can copy the UT3 files from the old prefix's steamapps folder so you don't have to re-download them. I usually trigger the download in Steam, then quit Steam and copy the files, and then start Steam again and let it finish the installation process.
As an aside, the "-m32" switch at configure-time seems unusual to me. Wine's build system should take care of that kind of thing for you. I'm wary of overriding Wine's build system without a reason for it.