Files with nc extension are also used by GEOS software. Some sort of error checking file.
NC file extension - Preprosessed GOC source non-error-checking (GEOS)
What is nc file? How to open nc files?
File type specification:
File extension nc is associated with the GEOS (Graphic Environment Operating System). It was an operating system from Berkeley Softworks (later GeoWorks).
Originally designed for the Commodore 64 and released in 1986, it provided a graphical user interface for this popular 8-bit computer. This version of GEOS is currently owned and distributed by Click Here Software Co.
List of recommended software applications associated to the .nc file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open nc file, edit nc file, convert nc file, view nc file, play nc file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with nc file - Preprosessed GOC source non-error-checking (GEOS)
Click on the software link for more information about GEOS. GEOS uses nc file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).