/usr/share/menu/smuxi-frontend-gnome is in smuxi-frontend-gnome 0.11~rc5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ?package(smuxi-frontend-gnome):needs="X11" section="Applications/Network/Communication"\
title="Smuxi" command="/usr/bin/smuxi-frontend-gnome"\
icon="/usr/share/icons/hicolor/scalable/apps/smuxi-frontend-gnome.svg"
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