http://bugs.winehq.org/show_bug.cgi?id=17978
--- Comment #4 from Jonathan Hartley tartley@tartley.com 2009-04-09 12:37:31 --- Understood & confirmed - deleting ~/.wine made the problem go away.
I thought that couldn't be the problem because I was installing on a brand-new fresh install of Wine specifically for this purpose, apparently I was wrong. Maybe Wine had been installed on this machine previously without my knowledge.
Sorry to waste your time.
Jonathan