1) Do File, New
2) Import the DXF created in Vector Engineer Pro-Tools, containing three polylines, from the attached ZIP.
3) Do Select All (CTRL+A), Zoom to fit drawing in window (4)
Expected: three objects
Observed: none. Inkscape reports No objects selected.

This file works fine in other programs e.g. VEPT itself, and Rhino 3D.
Any ideas?