HPGL Import for SolidWorks is an add-in for SolidWorks. This add-in gives SolidWorks the ability to import graphical data from Hewlett Packard Graphic Language Plot files.HPGL Import for SolidWorks is very easy to use as it adds a new file type to the SolidWorks File Open dialog box. To import a PLT file select a PLT file from the "File->Open" dialog box.