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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
R02 - Extension Details
Date Added: December 10, 2008
File Extension:  .R02
Description 1: .R02 is an extension associated with part two of a compressed archive that was created with RAR or WinRAR. The file is divided into several smaller parts, allowing for the saving of large archives on many disks. With this kind of file format, file extensions ranging from R00 to R99 may be used.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: RARLAB WinRAR Macintosh and Unix: RARLAB RAR (command line only)
Common:
Extension: