Importing Noteworthy Composer files can be done with EasyABC. nwc2abc is included (I assume) in the installable version of EasyABC which can be got from here. (I've not used that feature.)

It would be interesting to compare the ABC of the Longest Name Song converted from NWC to the version I posted up-thread which was converted from the NWC midi file, which had all those rests.

[Slightly OT: Users of EasyABC who know how to run it using Python may be interested in my post on c.net here.]