preinst is in telnet-ssl 0.17.40+0.2-1.
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 3 4 5 6 7 8 | #!/bin/sh
set -e
dpkg-divert --quiet --package ssltelnet --remove --rename \
--divert /usr/bin/telnet.nossl /usr/bin/telnet
dpkg-divert --quiet --package ssltelnet --remove --rename \
--divert /usr/man/man1/telnet.nossl.1.gz /usr/man/man1/telnet.1.gz
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