/usr/share/applications/screensavers/rd-bomb.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=RDbomb
Exec=/usr/lib/xscreensaver/rd-bomb -root
TryExec=/usr/lib/xscreensaver/rd-bomb
Comment=Draws a grid of growing square-like shapes that, once they overtake each other, react in unpredictable ways. "RD" stands for reaction-diffusion. Written by Scott Draves.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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