/usr/share/applications/screensavers/flow.desktop is in xscreensaver-data-extra 5.36-1ubuntu1.
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=Flow
Exec=/usr/lib/xscreensaver/flow -root
TryExec=/usr/lib/xscreensaver/flow
Comment=Strange attractors formed of flows in a 3D differential equation phase space. Features the popular attractors described by Lorentz, Roessler, Birkhoff and Duffing, and can discover entirely new attractors by itself. http://en.wikipedia.org/wiki/Attractor#Strange_attractor Written by Tim Auckland.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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