There's a simple fix to this,
First, you need to rename and set your printer as shared printer, and it's very important that you write down the name somewhere in a notepad maybe, because we'll need it and try to make it short without spaces.
Okay, next step, hold down "windows key" and press 'R', now we have the Run function on.
Type cmd and enter.
NOw we have the command prompt open.
NExt type this NET USE LPT1 \\your computer name \ the printer name
Copy /b \path\filename.prn LPT1:
NOw you'll be able to copy without having to issue command.