@Ruben Hartenstein notice the difference in the icons in your screenshot (they are notebooks) vs. the icons in the Arvind's post. You need to use this menu option to create an arbitrary file, not a notebook:
@Ruben Hartenstein notice the difference in the icons in your screenshot (they are notebooks) vs. the icons in the Arvind's post. You need to use this menu option to create an arbitrary file, not a notebook: