/usr/lib/libreoffice/share/xdg/qstart.desktop is in libreoffice-gtk 1:3.5.2-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version=1.0
Terminal=false
Type=Application
Categories=Office;
Exec=libreoffice --quickstart --nologo --nodefault
NoDisplay=true
Name=LibreOffice Quickstarter
Comment=Hook for quickstarter startup
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