preinst is in higan 094-2.
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 9 | #!/bin/sh
if [ "$1" = "upgrade" ]; then
if dpkg --compare-versions "$2" le "093-1"; then
set +e
update-alternatives --remove-all higan
set -e
fi;
fi;
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