I don't know what format your coordinates are in, but I did a little digging around and found this post by Marek, SDK post
, his import points2 file is an exe (which windows will complain about), as far as I can tell, the coordinates have to be in a specific format, with x y z separated by a space and decimal points as a comma.
I tested using a simple txt file in v19 using
0 0 0
5 5 5
10 10 10
etc. and it works fine.
It imports the coordinates as (tiny) points, so if you try it, use a blank TC file, and after clicking the 'plot points' button, in TC use CTRL+A to select all, and in the selection palette / properties, change the points to cross and a bit larger so you can see them.
Marek still visits the forum so if it looks like what you are after, maybe he will comment further.