http://bugs.winehq.org/show_bug.cgi?id=17915
--- Comment #3 from Igor Tarasov tarasov.igor@gmail.com 2009-04-04 01:10:44 --- Jonathan, how have you installed wine? Did you compile it? If so, you might rebuild it with jpeg libraries. Or install wine from prebuilt packages. http://wiki.winehq.org/MacOSX/Installing
Please, test if this helps.