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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
R01 - Extension Details
Date Added: December 10, 2008
File Extension:  .R01
Description 1: The .R01 file extension is linked to the WinRAR Split Archive. It refers to part one of a compressed archive that is split into a bunch of components or parts. Create this file when saving large archives on multiple disks, using extensions numbering from R00 all the way to R99. File archives bearing the ".Rxx extension can be created using either RAR for Unix and Macintosh or WinRAR for Windows.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: RARLAB WinRAR Macintosh and Unix: RARLAB RAR (command line only)
Common:
Extension: