http://bugs.winehq.org/show_bug.cgi?id=15975
--- Comment #5 from Andy angeldodger@tiscali.co.uk 2009-02-04 15:35:13 --- I'll try to find out, but in the mean time I seem to recall something about the way 2000 and XP handle transparent icons. Does that make sense? I'll do some googling and see what I can find...
Andy