/usr/share/menu/debian-installer-launcher is in debian-installer-launcher 19+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | ?package(debian-installer-launcher):needs="X11" section="Applications/System/Administration"\
title="Live Installer Launcher" longtitle="Debian Installer desktop launcher"\
description="This is a desktop launcher for Debian Installer images. It is intended to be used on Debian Live systems."\
command="su-to-root -X -c /usr/sbin/debian-installer-launcher" icon="/usr/share/pixmaps/debian-installer-launcher.xpm"
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