#Internal and #Registered are always present, and represent the Internal Viewer and the Registered Association respectively.
Preferences - Applications Page
&Viewer then the menu item will appear as Viewer and you will be able to select that item by pressing Alt/V.#Internal and #Registered cannot be modified because they are required for the program to operate correctly, but you can change their Name entries.#Internal and #Registered cannot be removed because they are required for the program to operate correctly.