What is the bit I used to create this project

I have a project carve that I created but I cant remember the bit I used (I know I should have written it down or as part of the project name). I have the .nc file. Can I import the file to find out the bit being used?

no, that data is not saved within the file. It would be a better practice to save that data into the workpiece name (click the small carrot icon in the workpiece preview at the bottom panel to edit the workpiece name) and that will save into the file name whenever you export the .nc file (for next time)