/usr/share/desktop-directories/ubuntustudio-noshow.directory is in ubuntustudio-menu 0.26.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | [Desktop Entry]
version=1.0
Type=Directory
Icon=system-help
X-Ubuntu-Gettext-Domain=gnome-menus
Name=Unused Menu
Comment=This to make a menu not show
NoDisplay=true
|