If you're unable to get KT to decompile the script for you, you can do it manually also. Extract the .ncs file to a folder and run the command line nwnnsscomp.exe utility to decompile the source code to .pcode. I believe the syntax is simply
nwnnsscomp -d my_ncs_file.ncs
As Kaspian intimated, you might be able to find the .nss file within the scripts.bif, or failing that, you could download the DeNCS utility (
http://www.lucasforums.com/showthread.php?t=149198) so that you don't have to interpret the .pcode yourself.
Sorry I can't provide direct KT assistance.