/usr/share/app-install/desktop/phototonic:phototonic.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 16 17 | [Desktop Entry]
X-AppInstall-Package=phototonic
X-AppInstall-Popcon=2
X-AppInstall-Section=universe
Name=Phototonic
Comment=View photos on your computer
GenericName=Image Viewer
Exec=phototonic %F
Icon=phototonic
Terminal=false
Type=Application
Categories=Graphics;Viewer;
StartupNotify=true
MimeType=image/png;image/gif;image/jpeg;image/bmp;image/svg+xml;
X-Ubuntu-Gettext-Domain=app-install-data
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