Notes about the NKI file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The NKI file type is primarily associated with 'Native Instruments' by Native Instruments, Inc.. Instrument file for Native Instruments samplers, i.e. Kontakt/Kompakt Player. Typically found in a subfolder called INSTRUMENTS under the LIBRARY folder.