I've tried accessing a floppy disk which contains programs for the MX2 on the PC. The file extension is .MX2. We can open them using notepad to view the G code.
I have tried copying one of the files and pasting my post processed program over the existing G code with it being saved as "123.MX2".
We can now see the program on the Prototrak in the program list, but when we try to open it there is nothing there.
I hope this all makes sense, as my descriptions can be a bit rubbish at times.