Paper fed into their trays. Blank sheets stacked up. Then, in perfect synchronization, they started printing.

Without more specific information, it's challenging to provide a precise description of what a DCCV1-51-PRN file entails. However, here are a few potential contexts:

Insert the drive into the printer’s front USB port while the printer is in "Ready" mode or displaying the error.

copy /b C:\DCCV1_51.prn \\YourComputerName\YourPrinterShareName Note: Use the switch to ensure the file is sent as binary data. HP Support Community Method 2: USB Flash Drive Format a USB flash drive as file to the root of the drive.

Which (Windows 10, 11, Linux?) are you using? What is the exact error message you see?