/usr/share/applications/3dchess.desktop is in 3dchess 0.8.1-19+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=Application
Version=1.0
Name=3D Chess
Comment=3D chess for X11
Comment[de]=3D-Schach für X11
Exec=3Dc
Icon=3dchess
Terminal=false
Categories=Game;BoardGame;
Keywords=chess;board;3D;X11;
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