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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:
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RMVB - Extension Details
Date Added: December 12, 2008
File Extension:  .RMVB
Description 1: .RMVB is the extension linked to the RealVideo Variable Bit Rate file. A variable bit rate is used to compress these Real Media video files so they are optimized for the videos content. The RMVB file is the standard Real Media or .RM file formats newer version With it, compression is more efficient. Most Asian and Anime movie titles utilize the RMVB file format since it offers lower bitrates, smaller file sizes and better quality than DivX.
File Type:   Video file
Mode: Binary
Program(s) to Open:  Mac, Windows and Unix: RealNetworks RealPlayer
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