This file is indexed.

preinst is in xfce4-settings 4.11.2-1ubuntu2.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

LASTVER="4.9.0"

if dpkg-maintscript-helper supports rm_conffile; then
  dpkg-maintscript-helper rm_conffile \
    /etc/xdg/autostart/xfce4-settings-helper-autostart.desktop "$LASTVER" -- "$@"
fi