/usr/share/applications/screensavers/fluidballs.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=FluidBalls
Exec=/usr/lib/xscreensaver/fluidballs -root
TryExec=/usr/lib/xscreensaver/fluidballs
Comment=Models the physics of bouncing balls, or of particles in a gas or fluid, depending on the settings. If "Shake Box" is selected, then every now and then, the box will be rotated, changing which direction is down (in order to keep the settled balls in motion.) Written by Peter Birtles and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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