/usr/share/app-install/desktop/kspaceduel:kde4__kspaceduel.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=kspaceduel
X-AppInstall-Popcon=57
X-AppInstall-Section=universe
Name=KSpaceDuel
MimeType=
Exec=kspaceduel -caption %c
GenericName=Space Arcade Game
Icon=kspaceduel
X-DocPath=kspaceduel/index.html
Type=Application
Terminal=false
X-KDE-StartupNotify=true
X-DBUS-StartupType=Multi
Categories=Qt;KDE;Game;ArcadeGame;
X-Ubuntu-Gettext-Domain=app-install-data
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