Filename Length Limitations in AutoCAD
AutoCAD has an internal limitation of 140 characters that it can send out to any Windows System Printer Driver if you are printing directly to our PDF-XChange for AcroPlot Pro printer driver from AutoCAD.
If you have combined paths and filenames that are longer than 140 characters you must set the AutoCAD System Variable FullPlotPath=0 so that AutoCAD only sends out the filename and not the path and filename to avoid having your filenames truncated. In this case we will not know which path to save the file in so you will have to specify the path in the Save As File Dialog or specify a path in the Printing Preferences Save Options of the PDF-XChange for AcroPlot Pro Printer Driver.
If you use our AcroPlot interface or one of the AcroPlot Menu options in AutoCAD we directly control the output filename instead of going through the Windows System Printer Driver name so you will not have this limitation.
The AutoCAD DWF and PDF built-in Heidi Drivers also do not have this limitation due to the fact that they do not go through the Windows System Printers either.