/usr/share/app-install/desktop/xboard:xboard-pgn-viewer.desktop is in app-install-data 15.10.
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 12 13 14 15 16 17 18 | [Desktop Entry]
X-AppInstall-Package=xboard
X-AppInstall-Popcon=75
X-AppInstall-Section=universe
Name=Xboard
Comment=Run XBoard as PGN viewer
GenericName=X-windows chess board
Type=Application
Categories=Game;BoardGame;
Exec=xboard -viewer -lgf %f
Icon=xboard
NoDisplay=true
Terminal=false
MimeType=application/x-chess-pgn;
X-Ubuntu-Gettext-Domain=app-install-data
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