/usr/share/applications/optgeo.desktop is in optgeo 2.21-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Encoding=UTF-8
Version=1.0
Type=Application
Exec=/usr/bin/optgeo
Icon=/usr/share/pixmaps/optgeo-48.png
Terminal=false
Name=OptGeo
GenericName=Simulator for geometrical optics
GenericName[fr_FR]=Simulateur d'optique géométrique
Comment=Interactive tool to study and simulate optic assemblies
Comment[fr_FR]=Outil interactif pour étudier et simuler des montages d'optique
Categories=GNOME;Application;Video;Education;Science;
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