https://bugs.winehq.org/show_bug.cgi?id=43694
--- Comment #2 from Ken Sharp imwellcushtymelike@gmail.com --- I've just tested Wine 2.16 and Staging 2.16 with an x86 installation (can't test x86-64 at the moment) and it all works fine here with the SETI@Home project.
Does it work if you install the x86 version? Is it specific to a project?
BOINC x86 7.8.2 Wine Gecko x86 2.47