preinst is in php-horde 5.1.5+debian1-1.
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 | dpkg-maintscript-helper mv_conffile \
/etc/apache2/conf.d/horde.conf /etc/apache2/conf-available/php-horde.conf 5.1.0+debian0-1~ -- "$@"
|