https://bugs.winehq.org/show_bug.cgi?id=50042
--- Comment #11 from Nikolay Sivov bunglehead@gmail.com --- (In reply to Bruni from comment #10)
If there is truly a difference between winforms in Framework vs Core, it should be possible to verify that on Windows.
The program from https://bugs.winehq.org/show_bug.cgi?id=50042#c0 opens two file dialogs in series on Windows 7. No exception.
Does that contradict my comment?