I'm guessing Paul is talking about "2D design" the software package (which includes CAM), rather than the specific two-dimensional design.

https://www.techsoft.co.uk/Products/Software/2DDesignV2

But ultimately routerdriver is correct, you need to do the CAM part of the software to generate the GCode for Mach3 to accept. If you've used the software package before to do this before though, I'm not sure what your question is!