http://bugs.winehq.org/show_bug.cgi?id=20910
--- Comment #7 from Owen Rudge owen@owenrudge.net 2009-12-22 01:21:38 --- (In reply to comment #6)
It seems that the game installs fine when the Steam directory is on the C: but not when on the Z:. I don't know if this is a Wine bug or a Steam bug.
What filesystems do you use for each of your partitions?