/usr/share/app-install/desktop/virtualbox-qt:virtualbox.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | [Desktop Entry]
X-AppInstall-Package=virtualbox-qt
X-AppInstall-Popcon=6462
X-AppInstall-Section=universe
Name=VirtualBox
GenericName=PC virtualization solution
Comment=Run several virtual systems on a single host computer
Type=Application
Exec=VirtualBox %U
TryExec=VirtualBox
MimeType=application/x-virtualbox-vbox;application/x-virtualbox-vbox-extpack;application/x-virtualbox-ovf;application/x-virtualbox-ova;
Icon=virtualbox
Categories=Emulator;Utility;
X-Ubuntu-Gettext-Domain=app-install-data
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