http://bugs.winehq.org/show_bug.cgi?id=17723
--- Comment #9 from Toby toby.murray@gmail.com 2009-10-24 00:01:16 --- Well I found another workaround... if you have another install of Audiosurf that is already logged in. It stores the username and password (in plaintext even!) in the following file under the steam install directory (C:\Program Files\Steam\ by default):
\steamapps\common\audiosurf\engine\Support\SavedConstants.cgr
If you copy that file from an audiosurf install that is already logged in, you will be automatically logged in when you start Audiosurf next time.