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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
RGN - Extension Details
Date Added: January 01, 1970
File Extension:  .RGN
Description 1: The RGN extension is tied up with the Garmin Regional Map file. Map data files that are saved in the database format have .RGN attached. RGN files contain maps of particular regions that are loadable using Garmin program software and GPS devices. Such files could also include info that are useful for updating the firmware of a GPS device.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: Garmin MapInstall, Garmin WebUpdater
Common:
Extension: