Reconfigure "Open Folder"

Just a note to myself, because I keep forgetting:

$ xdg-mime query default inode/directory
nautilus-folder-handler.desktop
$ locate Thunar.desktop
/usr/share/app-install/desktop/thunar:Thunar.desktop
/usr/share/applications/Thunar.desktop
/usr/share/xfce4/helpers/Thunar.desktop
$ xdg-mime default Thunar.desktop inode/directory