Thank you for responding.
I think you are mistaken, to suggest I am "comparing oranges to bricks: one has nothing to do with the other."
Oh, Yes, it does !
Both are produced by AutoCAD, both are program to generate drawings from a .DXF file, and the one replaces the other, so they have more in common than "other software or online viewers scattered all over the web" .
Be that as it may, thank you for that Link; I shall give it a go.