How about a 2d version of import points which assumes a z value of zero, (or a constant.) ?


Import the PW51 dxf, if available, or convert dwg to dxf, or ...

or
For the 2d PW51 text file, the commas can be replaced with period in text editor, notpad++, and probably a macro could add the z values of zero.
Or excel could concatenate z values and save to a text file.

-Brian