preinst is in exmh 1:2.8.0-5.
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.
1 2 3 4 | #!/bin/sh -e
# cleanup of html dirs in lib area (versions prior to 2.7.0)
[ -d /usr/lib/exmh/html/ ] && rm -r /usr/lib/exmh/html/ || exit 0
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