/usr/share/app-install/desktop/content-hub:content-hub-send.desktop is in app-install-data 15.10.
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 9 10 11 12 13 14 15 | [Desktop Entry]
X-AppInstall-Package=content-hub
X-AppInstall-Popcon=14
X-AppInstall-Section=universe
Name=Content Hub Send
Comment=Content Hub Send
Exec=content-hub-send %U
Icon=
Terminal=false
Type=Application
OnlyShowIn=Old
X-Ubuntu-Touch=true
X-Ubuntu-Gettext-Domain=app-install-data
|