This file is indexed.

/usr/share/applications/screensavers/celtic.desktop is in xscreensaver-data-extra 5.30-1+deb8u2.

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=Celtic
Exec=/usr/lib/xscreensaver/celtic -root
TryExec=/usr/lib/xscreensaver/celtic
Comment=Repeatedly draws random Celtic cross-stitch patterns. http://en.wikipedia.org/wiki/Celtic_knot Written by Max Froumentin.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;