Notes about the NCI 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 NCI file type is primarily associated with 'Mastercam' by CNC Software, Inc.. Mastercam has solutions for milling, turning, wire EDM and design. This file is usually in the .\MILL6\NCI folder.