Thanks for your reply!

However, you've gone right over my head!! I've never scripted anything before and not sure I'd know where to start...

As for wether or not our files as the right ASC format, I'm really not sure. Here is an abbreviated version of one of our .cad files, showing the start and end:

0 594 L0
0 590 F01
0 591 ZKONST 1 BCOD 856 ABXY 0.10 ABZ 0.40
0 528 0 2.00
0 591 ZKONST 0.000000
0 530 54687
0 501 -34.90 -15.60 0.00
0 501 -34.90 -15.40 0.00
0 501 -34.90 -15.20 0.00
0 501 -34.90 -15.00 0.00
0 501 -34.90 -14.80 0.00
0 501 -34.90 -14.60 0.00
.
.
.
.
.
0 501 34.90 -15.40 0.80
0 501 34.90 -15.10 0.80
0 531
0 529