/usr/share/applications/screensavers/slip.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.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=Slip
Exec=/usr/lib/xscreensaver/slip -root
TryExec=/usr/lib/xscreensaver/slip
Comment=This throws some random bits on the screen, then sucks them through a jet engine and spews them out the other side. To avoid turning the image completely to mush, every now and then it will it interject some splashes of color into the scene, or go into a spin cycle, or stretch the image like taffy. Written by Scott Draves and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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