Well DOS only likes 8 character file names, and up to 3 character filename extensions, but other than that, you should be able to change the extension from nc or tap to prt. You can do this on your windows computer, or you can do it the hard way, by using the REN command in DOS, at the command line.
However, you would still need to format the code in the file to match whatever Hurco requires for gcode or conversational, or whatever.
There, that is 2 cents worth
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)