https://bugs.winehq.org/show_bug.cgi?id=41361
--- Comment #8 from Reinhold reinhold.hoffmann@hotmail.com --- I did a more verbose tracing within the custom action.
Please find in the zip: (1) log of installation (2) log of uninstallation (3) test msi (4) source code of custom acion which is called in Install, Commit and should be called in Uninstll phase, too.
But for uninstall it is not called at all. No MessageBox show up.