This file is indexed.

/usr/share/applications/screensavers/slidescreen.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.

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=SlideScreen
Exec=/usr/lib/xscreensaver/slidescreen -root
TryExec=/usr/lib/xscreensaver/slidescreen
Comment=This takes an image, divides it into a grid, and then randomly shuffles the squares around as if it was one of those "fifteen-puzzle" games where there is a grid of squares, one of which is missing. http://en.wikipedia.org/wiki/Fifteen_puzzle Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;