print as pdf saves as prn file format

FINDINGS:

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• Microsoft Print to PDF may print to a .PRN file (or do nothing) if you had removed Microsoft Print to PDF and later installed it manually using the Add a Printer wizard, specifying an incorrect port. Microsoft Print to PDF wouldn’t work if you chose LPT1 (as the default Port in the “Add Printer” wizard) or FILE: (Print to File) option in the Ports list box. For Microsoft Print to PDF, PORTPROMPT: is the correct port setting.
• The Port details can be checked via Printer properties, Ports tab. Alternately, running the following command (from the Run dialog) would show the Printer configuration.