http://bugs.winehq.org/show_bug.cgi?id=12451
--- Comment #2 from foobard jens@porup.com 2008-05-09 22:15:02 --- Confirm still exists in 1.0-rc1.
More interesting, however, is that this bug does NOT exist in Acrobat Pro 7 and Acrobat Reader 7. Both successfully detect Firefox and launch a new tab/browser with the target Adobe web page.