/usr/share/app-install/desktop/sagcad:sagcad.desktop is in app-install-data 0.12.04.4.
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=sagcad
X-AppInstall-Popcon=153
X-AppInstall-Section=universe
Type=Application
Name=SagCAD
GenericName=CAD/CAM system
Comment=Draw and create
Categories=GTK;Graphics;
Exec=sagcad
Icon=sagcad
StartupNotify=true
Terminal=false
X-Ubuntu-Gettext-Domain=app-install-data
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