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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
RM - Extension Details
Date Added: January 01, 1970
File Extension:  .RM
Description 1: RM stands for Real Media file. It is the extension for files with RealNetworks content created by a program that RealNetworks developed. RealVideo as well as RealAudio codecs are used to compress the content, which is then stored in a RealNetworks file format. A RealOne player is needed to play RealNetworks content. RM files come in both downloaded and streaming media files, allowing for playback while downloading.
File Type:   Video file
Mode: Binary
Program(s) to Open:  Mac, Windows and Unix: RealNetworks RealPlayer, VideoLAN VLC media player (partial support), web browser with RealPlayer plugin
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