Have you tried to save the PICT file as a TIFF and then import it into your Plotmaker file?
Windows do not 'do' Pict's as far as I know.
jacek lisiewicz
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arkhos-tekton, architects
carmichael, ca
Mac OS X 10.15.5
IMac Retina 5K, Intel Core I7
32 GIG Memory, AMD Radeon R9
ArchiCAD 24