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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
RGP - Extension Details
Date Added: July 01, 2009
File Extension:  .RGP
Description 1: .RGP is the file extension tied to the RealArcade Game Package. An RGP file includes data that RealArcade games utilize RealNetworks developed this portal for downloading as well as purchasing arcade games. Never open RGP files as unknown email attachments as it is possible that the said files contain malicious code.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Mac and Windows: RealArcade
Common:
Extension: