This file is indexed.

/usr/share/applications/screensavers/cubicgrid.desktop is in xscreensaver-gl-extra 5.36-1ubuntu1.

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=CubicGrid
Exec=/usr/lib/xscreensaver/cubicgrid -root
TryExec=/usr/lib/xscreensaver/cubicgrid
Comment=Draws the view of an observer located inside a rotating 3D lattice of colored points. Written by Vasek Potocek.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;