A .PRN file is a printer-specific file that contains the print commands embedded in the file data, so that you can print the file later without needing the software program as long the printer understands the instructions in the file. I'm not sure why you ended up with that choice. Did you choose the option "Print fo file" in your Printer properties dialog box to save your return as a .PRN?
You'll likely have to do an Internet search on how to print out a .PRN file. I occasionally used a .PRN file for desktop publishing years ago, but not in recent years. I just now quickly searched around the Internet to refresh my memory, and when using Windows, to print it out typically uses a command line to copy the *.PRN file to your printer port or system "printername." Such as "C:\copy *.prn /b printername" (if using a USB or network cable). You have to use the correct "path to file" in the command or be in the same directory as the PRN file and use the correct System name of the printer as it's shown in your System printers settings. The /b means it's a binary file. If you are using an old parallel LPT1 cable instead of a network/USB cable, it would be "C:\copy *.PRN /b LPT1", again using the correct file path to the *.PRN or be in same directory. Anyway, that's from my cursory search of the Web just now, so I can't vouch for the accuracy. You'll have to do the homework.
