How to disable Office key keyboard shortcut opening Office app?

Just upgraded to Windows 1903 and hit this myself, seems Microsoft decided to assign the keyboard shortcut for the new Office App to Win+Ctrl+Alt+Shift! (aka HYPR key combination for QMK users)

Changing the open command for this keyboard shortcut to rundll32 resolved the issue for me. Using an elevated cmd, run the following command:

    REG ADD HKCU\Software\Classes\ms-officeapp\Shell\Open\Command /t REG_SZ /d rundll32