This file is indexed.

preinst is in libgtk2.0-common 2.24.25-3+deb8u2.

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

if [ -L /usr/share/doc/libgtk2.0-common ]; then
    rm -f /usr/share/doc/libgtk2.0-common
fi