http://bugs.winehq.org/show_bug.cgi?id=6095
--- Comment #65 from Jan Kalab pitlicek@gmail.com 2010-06-25 08:30:50 --- (In reply to comment #63)
And is the update mandatory? If so, we can close this bug as resolved / moot.
Yes, it is. http://store.steampowered.com/news/3976/
But as NSLW said, it only fixes CS:S, not CS 1.6.