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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
RFM - Extension Details
Date Added: February 11, 2008
File Extension:  .RFM
Description 1: The .RFM file extension is associated with the rFactor Modification file. It is a Mod file that is useful for changing rFactor car and track settings. rFactor is a 3D race simulation game that is saved in text format and allows for modification using a text editor. Users can adjust parameters values in RFM files as a way to alter gameplays.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: Image Space rFactor, edit with a text editor
Common:
Extension: