From the vector Forum:

"You cannot backplot with Vector Cad. You must have access to Vector Cam.

The process is as follows:

Select the CNC code to be backplotted in the NC editor
Special Backplot
Move the focus to the Cad window
Edit-Paste.

The following commands are supported in most of the drivers:

G00, 01, 02, 03, 17, 18, 19, 90, 91

Vector Cam can backplot lathe, mill, 4 axis wire EDM (X-Y-U-V), Heidenhain, and Shopbot SBP code. This may not be activated in our demo version. 3D arcs in ISO g-code are supported as well."
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depending on the part, it is sometimes better to use less points in a file and model the part from there.

Ron