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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
RCD - Extension Details
Date Added: January 01, 1970
File Extension:  .RCD
Description 1: The .RCD file extension is linked to a dynamic physical simulation document format. Arcade, an application providing realtime modeling of physical structures through computational methods or techniques from computer games, uses the RCD file format. University of Virginia is the one behind the Arcade freeware program. Arcade is developed as well as distributed by the same university.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Arcade structure modeling program
Common:
Extension: