This file is indexed.

postinst is in desktop-file-utils 0.20-0ubuntu2.

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

update-desktop-database -q

if [ "$1" = "triggered" ]; then
    exit 0
fi