/usr/share/applications/screensavers/engine.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.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=Engine
Exec=/usr/lib/xscreensaver/engine -root
TryExec=/usr/lib/xscreensaver/engine
Comment=Draws a simple model of an engine that floats around the screen. http://en.wikipedia.org/wiki/Internal_combustion_engine#Operation Written by Ben Buxton and Ed Beroset.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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