I have version 5.4.1 Rev2 dating back to 2005.
It opens .plt files just fine; Including ones generated the other day.
Edit; just checked the page link above and down the page is;
"HP-GL/2 Vector images. This format is normally used from plotters."
End edit....
Every now and then I get a plt instead of a pdf from a contractor and this program opens them up and displays the graphics just like a pdf.
It's a real 'can-opener!'
Mark
Mac G5 Dual 2.3 Ghz, 1.5 Gb, Mac OSX.4.11, ArchiCAD 12 2782 USA Full + 11, 10, 9 & 7
Mark R. Wallace AIA
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Mark R. Wallace AIA
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MacBook 2.53 Ghz, Intel Core i5, 8 Gb,
Mac OSX (Sierra 10.12.6,
ArchiCAD 22 USA Full, +21, & 20.