This file is indexed.

prerm is in xpilot-ng-client-x11 1:4.7.3-2.2ubuntu1.

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 [ "$1" = remove ]; then
    update-alternatives --remove xpilot /usr/games/xpilot-ng-x11
    update-alternatives --remove xpilot-ng /usr/games/xpilot-ng-x11
fi