Print To Default Printer (PTDP) is a utility to send any file to your default printer. If you are using a printer connect to a virtual port, i.e.: USB printers, you may not be able to use this program. If you can not normally send a file to the printer from the command line (copy /b filename.ext lpt1 where filename.ext is the file to be sent to the printer and lpt1 is the printer port), you will not be able to use this program.