Hi Stuart,
that is exactly what I did - there's one file in the zip, the Fusion 360 file. If you look at the video, you will see two instances of Fusion 360 open - the second one opened with your file when I clicked on it. The video shows in real time I did nothing other than select the default preprocessor (Mach4) and all I get is the error message. I did nothing else! Seems no-one believes it doesn't work, even despite the video evidence!
Also, all my GCode .tap files are small text files, much less than 6Megs (normally a few k, for the most complex).
I don't understand the issue...but thanks for trying.
Regards,
Barry