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How to Open a PC3 File. A file with the PC3 file extension is likely to be a Plotter Configuration file for an Autodesk application. PC3 files are used with the Autodesk AutoCAD application to ...
Open the file type drop-down menu and choose either "AutoCAD Drawing (.dwg)" or "AutoCAD Interchange File (.dxf)" depending on what type of AutoCAD file you want to import.