Which is the best way to load files?
NKX files are Monolith type of files (containing scripting, audio samples, instrument definitions, etc.) and cannot be loaded directly into Kontakt. They are used by VSTi instrument definitions (as below).
You will want to load the NKI (instrument files), NKM (multi instrument files), or NKB (instrument bank files)
The latest online & PDF manuals for Kontakt are available here:
https://www.native-instruments.com/en/products/komplete/samplers/kontakt-6/downloads/
Thank you you your help!!!