File Extension WEBPNP File Format Internet Printing file WEBPNP stands for Internet Printing file. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Printing a PDF File Internet slows down when one old server goes down File transfer to the iSeries problem.