There is only one file type that uses the .NCFG extension:
ArcGIS Explorer Configuration File
Application configuration file used by ArcGIS Explorer, a free GIS program developed by ESRI; contains settings that customize the program, including the user interface, splash screen, logo, application title, and application permissions; allows users to control the appearance and behavior of ArcGIS Explorer.
NCFG files can be shared via email or hosted by a network location. This is useful in office environments for system administrators who want to streamline enterprise-wide installations, each with specific capabilities, limitations, and appearances.
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Updated: September 16, 2010