This file is indexed.

preinst is in xorg 1:7.7+1ubuntu8.

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
# Undo doc-dir symlinking.  Leave this to pkgbinarymangler.
# This can be removed after the next LTS
if [ "$1" = upgrade ] && [ -L /usr/share/doc/xorg ]; then
    rm -f /usr/share/doc/xorg
fi