Curve through xyz not working

Team
I have been trying to upload coordinates for a curve utilising the Through XYZ feature. Every time I open the feature the system seems to hold up. The Curve File data box that I see open in every tutorial fails to open in my application. The only way to progress is to shutdown the program. I have tried to source an answer on the net and various forums with not success. If anyone could assist I would be most grateful.
Sincerely