Hi, ZASto,
I use mostly Protel 2.8 for pcb design. But, because sometimes it makes mistakes when generating drill file, I use Altium Designer for generating drill file.
After this, I have my son's program, written in Python, to generate G-code for each drill diameter (Tool). Format is 2:3 absolute inch, none zero suppressed.
Also, I do preparation for my friend who has pcb production business and I have many different pcb design programs installed on my computer. Because, every client send pcb design in different program, and I need to accept and process it. But always mostly it ends with Protel (Simple and enough efficient).
Please, send me more info on your conversion software.
BTW, your nick name is familiar to me, don't knew where from. Which country are you living?
mrpeja