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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
RGE - Extension Details
Date Added: January 01, 1970
File Extension:  .RGE
Description 1: RGE is the extension linked to files archiving items from a particular Entourage database. These files sometimes include tasks, notes, mail messages, contacts, project files and calendar events. Creating .RGE files is done through the use of the Export command found on the Entourage File menu. The files allow for importation with the help of the Import command.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Macintosh: Microsoft Entourage
Common:
Extension: