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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
REV - Extension Details
Date Added: March 11, 2008
File Extension:  .REV
Description 1: The .REV file extension has to do with recovery volumes created using RAR file compression and archiving program software. REV files contain redundancy data that users can use to reconstruct missing files within the RAR volume set. This type of file is only seen utilized for multivolume archives. Remember: if the number of corrupt or missing volumes exceeds that of the REV files, reconstructing the volume set is not possible.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: RARLAB WinRAR
Common:
Extension: