I purchased some files that are in NC file formats. How do I open them in Carbide create?
You can’t. .NC files are not design files, they are the final output from the design software that you load into Carbide Motion to actually make the cut.
I personally would never buy designs that only came as .NC. There’s is no way I’m going to let someone else pick out my tooling, and feeds and speeds.
If you want to see ‘what they do’, this website will load them and show you the paths programmed:
There is a 3rd party tool which will extract the geometry from the G-code:
but how well it will work will depend on the specifics of the file in question.