/usr/share/applications/xball.desktop is in xball 3.0.1-2.
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 11 | [Desktop Entry]
Version=1.0
Name=XBall
Comment=simulate bouncing balls in a window
Comment[de]=simuliere springende Bälle in einem Fenster
Exec=xball
Icon=xball
Terminal=false
Type=Application
Categories=Game;Simulation;
Keywords=balls;X;window;bouncing;
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