Description: PLT Import for AutoCAD is a HPGL Plot (.plt) file import plug-in for AutoCADŽ. This plug-in gives AutoCAD the ability to import geometric data from ASCII and Binary PLT files. PLT Import for AutoCAD reads pen movement data stored PLT files and imports it into AutoCAD. A HPGL PLT file is comprised of a set of instructions related to pen movements of HPGL plotters. PLT Import for AutoCAD reads these pen movement instructions and creates curves.