Droppings left behind on Windows after uninstall

[philrz]

The community user that opened #2685 made us aware of some ways Zui v1.0.0 uninstall doesn't fully clean up after itself on Windows. Here's my own list of findings after doing a single-user install/uninstall on a scratch Windows VM on AWS.

1. Empty directory%USERPROFILE%\AppData\Local\Programs\Zui is left behind

2. Directory %USERPROFILE%\AppData\Local\zui-updater is left behind with a 270 MB installer.exe in it

3. Registry entries left behind:

   Computer\HKEY_CLASSES_ROOT\zui
   

   Computer\HKEY_CLASSES_ROOT\zui\shell\open\command
   

   Computer\HKEY_CURRENT_USER\Software\Classes\zui
   

   Computer\HKEY_CURRENT_USER\Software\Classes\zui\shell\open\command
   

   Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts
   

   Computer\HKEY_USERS\S-1-5-21-1631746973-818778185-1887858790-500\Software\Classes\zui
   

   Computer\HKEY_USERS\S-1-5-21-1631746973-818778185-1887858790-500\Software\Classes\zui\shell\open\command
   

   Computer\HKEY_USERS\S-1-5-21-1631746973-818778185-1887858790-500\Software\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts
   

   Computer\HKEY_USERS\S-1-5-21-1631746973-818778185-1887858790-500_Classes\zui
   

   Computer\HKEY_USERS\S-1-5-21-1631746973-818778185-1887858790-500_Classes\zui\shell\open\command
   

I'm not quite Windows savvy enough to know the significance of all those entires but the references to URL:zui tipped me off for one thing to try. After uninstall if I enter a URL starting with zui:// in the browser, I do get this pop-up:

Whereas if I enter some other garbage URL like foo://bar it jumps right into doing a Google search for that string.