http://bugs.winehq.org/show_bug.cgi?id=12640
--- Comment #5 from Austin English austinenglish@gmail.com 2008-04-19 18:17:24 --- (In reply to comment #4)
I think, it is impossible. As I have already written. In 0.9.58 is it working, and in 0.9.59 it is broken completely (no item in taskbar) by bug 12264. This was risen after fixing that bug.
No, not impossible, just more difficult ;-).
http://wiki.winehq.org/ReverseRegressionTesting
May help. Essentially, you'll need to identify the patch(es) that fixed the problem, then apply the patches before each regression test.