postinst is in jarwrapper 0.45ubuntu1.
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 --
set -e
if test -x /usr/sbin/update-binfmts ; then
update-binfmts --install jarwrapper /usr/bin/jarwrapper --magic 'PK\x03\x04' --detector /usr/bin/jardetector
fi
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