http://bugs.winehq.org/show_bug.cgi?id=33753
--- Comment #15 from papon.jonathan@laposte.net 2013-06-09 03:08:14 CDT --- Ok, so I double checked; adding the 2 lines back did bring back the regression for this application.
Then I applied the patch you've provided; the application is working again in the loopback scenario (ie:hosting a multiplayer game, and playing on your own).
I'll try to get another client to test the patch with another client connecting to the host as soon as possible.