http://bugs.winehq.org/show_bug.cgi?id=24345
--- Comment #2 from Ettore Atalan atalanttore@googlemail.com 2010-09-11 12:31:14 CDT --- I found out that there are two uninstallation procedures on Windows.
On Windows: This setup dialog just appears, when you click on "Uninstall Tunebite" in the program menu. It doesn't appear, when you chose uninstall in the Windows system settings menu.