I've made a post about it on playonlinux.com
You can see it here : http://www.playonlinux.com/forums/see_topic.php?topic=414 http://www.playonlinux.com/forums/see_topic.php?topic=414 You should use another version of wine, not 0.9.45 0.9.40>= have lot of troubles with steam and Dsound. Take a look at my post, playonlinux.com is very easy to use and should help you :)