https://bugs.winehq.org/show_bug.cgi?id=37835
--- Comment #4 from Rosanne DiMesio dimesio@earthlink.net --- (In reply to Ken Sharp from comment #3)
Which uninstaller is invoked from the menu item, for example? And how is a user supposed to know this?
The menu items for Wine's builtin apps aren't part of Wine, they're added by the distros. Presumably the distros could change them to use wine64 rather than wine, though I don't know if that would cause problems with 32 bit apps.
I've added the info on wine64 to the uninstaller section of the FAQ.