GHOSTPDF.INF This .inf file is intended to be used with the ghostpdf.cat file which should have been supplied with it and must be present in the same directory for installaion. The ghostpdf.cat file provides the driver signature necessary for installation on recent versions of Windows, however it also means that this .inf file cannot be installed using right-click->Install (or double-click on the .inf file). On all versions of Windows you must install this device from the Control Panel using Add Printer.