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format file unl

What is an unl file and how do I open an unl file?

UNL is a backup file created by MapSource, a program used to manage maps for Garmin navigational devices. It contains unlock codes for maps; used as a backup copy so that the codes can be restored back to the Garmin device.

Recommended unl file download:
Garmin MapSource
Detail unl file extension information:
File Type: unl
File Format: Garmin Unlock File
Primary Association: Multiple Use Files