Well, it looks like the people that sent me the EP drawing were mixing some c3d points, along with EP points, and recycling point numbers. So Jeff's routine worked, but kept failing thanks to that.
I ended up taking the file home, and running it through Carlson w/ Intellicad, and did a straight conversion of EP points to Carlson points, then exported that to a PNEZD text file. Come Monday, I'll see about slurping that into the company 2014 C3d. (My home box only has 2017 installed now - I had to clear space and nuked a bunch of stuff
I suppose if you're the 800lb gorilla in the room, thinking about interoperability with the competition just never gets thought about. Evn when the competion (EaglePoint) is now no longer competing, but supporting & selling training on c3d.