/usr/share/applications/screensavers/polyhedra.desktop is in xscreensaver-gl-extra 5.15-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Polyhedra
Exec=/usr/lib/xscreensaver/polyhedra -root
TryExec=/usr/lib/xscreensaver/polyhedra
Comment=Displays different 3D solids and some information about each. A new solid is chosen every few seconds. There are 75 uniform polyhedra, plus 5 infinite sets of prisms and antiprisms; including their duals brings the total to 160. http://en.wikipedia.org/wiki/Uniform_polyhedra Written by Dr. Zvi Har'El and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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