dot CNC files?

Hi all,

I have been given a file that is in servo cnc format and has the file
ending .cnc
I would like to be able to view this in three dimensions and also
convert it to dfx or standard gcode.

Is there any free software that will do it or anyone out there who
might be willing to convert it for me?

I downloaded a few gcode viewers but non seem to work correctly with
the file.

Thanks

Graham