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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
R1M - Extension Details
Date Added: December 10, 2008
File Extension:  .R1M
Description 1: .R1M is an extension referring to a temporary file that RealOne Player or RealPlayer saves when streaming media files that are downloaded from the Net. An .R1M file is created to form a buffer while RealOne Player is busy streaming a particular media file. This type of file is not meant for opening by the user.
File Type:   Audio file
Mode: Binary
Program(s) to Open:  Mac and Windows: RealNetworks RealPlayer
Common:
Extension: