/usr/share/app-install/desktop/horae:hephaestus.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.
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X-AppInstall-Package=horae
X-AppInstall-Popcon=1
X-AppInstall-Section=multiverse
Type=Application
Encoding=UTF-8
Name=Hephaestus
Comment=The x-ray absorption spectroscopist's periodic table
GenericName=X-ray Absorption Data Tables
Icon=_usr_share_pixmaps_hephaestus
Exec=hephaestus %F
Terminal=False
StartupNotify=true
Categories=Education;Science;DataVisualization;
X-Ubuntu-Gettext-Domain=app-install-data
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