http://bugs.winehq.org/show_bug.cgi?id=33974
--- Comment #6 from Dan Kegel dank@kegel.com 2013-07-07 15:05:43 CDT --- I bet steam's crashhandler.dll or friends is catching them.
+seh can add a little info to the log about the crash, but probably isn't useful in and of itself.
(I wonder what happens if you disable crashhandler.dll.)