right now when I try to run a file I get a "unknown word starting at r on line 1" error
A good one to use is ISO G-CODE. There are a few ISO posts ie: modal and non modal but try the one that comes with the install that just reads ISO_GCODE as its file name, if you are still having problems, send me a copy of your posted file and I will help you fix the problem.
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)