This file is indexed.

/usr/share/applications/screensavers/crystal.desktop is in xscreensaver-data-extra 5.36-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Desktop Entry]
Name=Crystal
Exec=/usr/lib/xscreensaver/crystal -root
TryExec=/usr/lib/xscreensaver/crystal
Comment=Moving polygons, similar to a kaleidoscope. See also the "Kaleidescope" and "GLeidescope" screen savers. http://en.wikipedia.org/wiki/Kaleidoscope Written by Jouk Jansen.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;