/usr/share/desktop-directories/X-Unity-All-Applications.directory is in unity-lens-applications 5.10.0-0ubuntu1.
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 | [Desktop Entry]
_Name=All Applications
_Comment=All Available Applications
Icon=applications-other
Type=Directory
X-Ubuntu-Gettext-Domain=unity-lens-applications
|