http://bugs.winehq.org/show_bug.cgi?id=17581
--- Comment #7 from Vitaliy Margolen vitaliy@kievinfo.com 2009-03-05 09:33:14 --- Works for me. Have you tried to completely remove wineprefix and reinstall steam with wine_gecko?
Also I get much more in the terminal then those two lines. When we ask for "terminal output" you have to post everything from the start, including the exact command you used to run the app with.