prerm is in heroes-sdl 0.21-9ubuntu1.
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.
1 2 3 4 5 6 7 | #!/bin/sh
#
# Contains the magic to deregister the package.
if [ "$1" = remove ]; then
update-alternatives --remove heroes /usr/games/heroes-sdl
fi
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