postinst is in libopenni-sensor-primesense0 5.1.0.41-8.
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 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26  | #!/bin/sh
set -e
MODULE_DIR="/usr/lib/"
MODULES="libXnDeviceSensorV2.so.0 libXnDeviceFile.so.0"
case "$1" in
    configure)
        for module in $MODULES; do
          niReg -r $MODULE_DIR/$module /etc/openni
        done
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
exit 0
 |