https://bugs.winehq.org/show_bug.cgi?id=40578
--- Comment #2 from Hans Leidekker hans@meelstraat.net --- This happens on Windows too if you run it with full UI:
msiexec /uninstall mono-4.0.2-gtksharp-2.12.26-win32-0.msi /qf
We could change msiexec to run uninstall with basic UI like Windows does, but the basic dialogs are not implemented, so there would be no feedback.