This file is indexed.

preinst is in libgtk2.0-dev 2.24.23-0ubuntu1.4.

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

# remove /usr/share/doc symlinks as it's a directory since 2.12.5-2
pkg=libgtk2.0-dev
oldsymtarget=libgtk2.0-0
if [ "$1" = upgrade ] && [ -L /usr/share/doc/$pkg ] && [ $oldsymtarget = "$(readlink /usr/share/doc/$pkg)" ]; then
    rm -f /usr/share/doc/$pkg
fi