PLT (HPGL) (.plt) is a vector-based plotter file introduced by Autodesk, Inc. and contains information for a certain CAD file. Plotting details require accuracy and precision in production, and usage of PLT file guarantee this as all images are printed using lines instead of dots.
Learn more about this file format here
GroupDocs.Viewer (in GroupDocs.Viewer.dll) Version: 20.6
public static readonly FileType PLT
Public Shared ReadOnly PLT As FileType
static initonly FileType^ PLT