It may not matter, but if you're using Mach, wouldn't it make more sense to use the Mach3 post processor (Mach2/3 Arcs (mm) (*.txt))?
I accidentally used that possessor and had a lot of problems, in fact I had to contact Vectric Support. Use the generic one I mentioned. You need a .tap file not a .txt. If using a rotary, then the processor would Mach 2/3-Wrap X2A ATC (mm)(.txt) Changing X to Y if the rotary runs length to length, and (inch) if not using metric.