The file x420xll.dll is a Language Resource component of the Xerox WorkCentre Pro 420 XL from Xerox. This is part of a printer driver. A driver is software that allows your computer to interact with a piece of hardware like a printer.
A single driver may work with multiple printers, this one works with the Xerox WorkCentre 415 and the Xerox WorkCentre 420 Pro XL. If you are getting errors with the x420xll dynamic link library file, you may not be able to print on your Xerox WorkCentre printer.
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