/usr/share/applications/screensavers/euler2d.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=Euler2D
Exec=/usr/lib/xscreensaver/euler2d -root
TryExec=/usr/lib/xscreensaver/euler2d
Comment=Simulates two dimensional incompressible inviscid fluid flow. http://en.wikipedia.org/wiki/Euler_equations_%28fluid_dynamics%29 http://en.wikipedia.org/wiki/Inviscid_flow Written by Stephen Montgomery-Smith.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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