MaxNC mill + TurboCAD 5.0 pro question... HELP! 8^)

Hello,

I have a Max NC-10 machining mill and TurboCad professional 5.0.
The Max software will accept .DXF files but only if they are
converted to "polylines" first. Can anyone give me a clue how to
convert my drawing to polylines and/or some other software that will
convert regular .dxf drawings to NC code?

For example: Go into TurboCad, draw a circle at coordinate 0,0 with a
radius of 1/2", line width of .08" and save the file as .DXF. When I
run Mill or MillNC it says "No polylines found" but when I go back
into TurboCad and open the .DXF is shows the circle just fine. What
is going on? I'm sure its a simple problem but its driving me batty!

Thanks from a new CNC/CAD newbie!
Tracy

(P.S. Expert Delphi programmer, just new to CAD/CAM 8^)