This file is indexed.

preinst is in xubuntu-icon-theme 18.04.5.

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

# In 13.10.0 elementary-xfce-darker/actions/16 was a symlink to elementary-xfce/actions/16
case "$1" in
install|upgrade)
    if dpkg --compare-versions "$2" lt "13.10.2"; then
      [ -h /usr/share/icons/elementary-xfce-darker/actions/16 ] && rm /usr/share/icons/elementary-xfce-darker/actions/16 || true
    fi
esac