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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
REG - Extension Details
Date Added: March 11, 2008
File Extension:  .REG
Description 1: .REG files update the Windows registry when they are run. Altering Windows different aspects is possible through the creation of custom REG files. Users can create their own registry update files by: Launching Regedit (Start menu>Run then type "Regedit), Selecting the registry section the user wants to modify, Selecting Export from the File menu, Choosing "Selected Branch from the Export Range option (bottom of window), and Saving the files as .reg files. Manual registry updating is a complex process that should be left to experts. Incorrect registry updating can render PCs inoperable.
File Type:   System file
Mode: Binary
Program(s) to Open:  Windows: edit with Regedit, runs itself when corresponding applications are run
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