/usr/share/app-install/desktop/hedgewars:hedgewars.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.
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X-AppInstall-Package=hedgewars
X-AppInstall-Popcon=58
X-AppInstall-Keywords= hedge;wars;war;hedgewar;worms;wormux;battle;fight
X-AppInstall-Section=universe
Type=Application
Version=1.0
Name=Hedgewars
Keywords=game;strategy;
GenericName=Fighting Hedgehogs
Icon=hedgewars
Exec=hedgewars %U
Terminal=false
StartupNotify=false
Categories=Game;StrategyGame;
MimeType=x-scheme-handler/hwplay;
X-Ubuntu-Gettext-Domain=app-install-data
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