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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
R00 - Extension Details
Date Added: January 01, 1970
File Extension:  .R00
Description 1: .R00 refers to WinRAR archivers native format RAR. These are data containers that store one or more files in compressed form. After downloading RAR files off the Net, a user has to unpack its contents to be able to start using it. Some RAR files consist of parts of multivolume sequences. Huge archives can be split in WinRAR to form smaller files called volumes as in .00, .r01, or .part1.rar, .part2.rar and so on. When unpacking volumes, put them all in one folder and start extracting from the first volume. RAR files carry advanced features: more convenient multivolume or multipart archives, tight compression including special solid text and multimedia modes, strong AES128 encryption, Unicode support in processing nonEnglish file names and recovery records that help in repairing archives in case physical data damage occurs.
File Type:   Archive/Compressed file
Mode: Binary
Program(s) to Open:  Windows: RARLAB WinRAR, Vuchiri SplitnJoin Macintosh: UnRarX, RARLAB RAR (command line only) Unix: RARLAB RAR (command line only)
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