This file is indexed.

/usr/share/applications/screensavers/blocktube.desktop is in xscreensaver-gl-extra 5.34-2ubuntu1.

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=BlockTube
Exec=/usr/lib/xscreensaver/blocktube -root
TryExec=/usr/lib/xscreensaver/blocktube
Comment=Draws a swirling, falling tunnel of reflective slabs. They fade from hue to hue. Written by Lars R. Damerow.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;