/usr/share/app-install/desktop/mm3d:mm3d.desktop is in app-install-data 14.04.0.
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 | [Desktop Entry]
X-AppInstall-Package=mm3d
X-AppInstall-Popcon=36
X-AppInstall-Section=universe
Name=Misfit Model 3D
Comment=Create and edit 3D models and animations
Exec=mm3d
Terminal=false
Type=Application
Categories=Application;Graphics;
X-Ubuntu-Gettext-Domain=app-install-data
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