Specifies the PostScript prolog file, the content of which is copied into PostScript print files. The file name can include a full or partial path specification. In the absence of a full path specification, the MS_PLTCFG_PATH configuration variable is used to complete the specification. Normally, prolog files are stored in the same directory as the printer driver configuration file.

If this property is not defined, the pscript.pro prolog file is used to provide the header for the PostScript file.