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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
RCG - Extension Details
Date Added: January 01, 1970
File Extension:  .RCG
Description 1: RCG is the data file Recog uses. Recog is a program that works by learning and recognizing symbols and characters. It features character recognition data, allowing Recog to easily identify any mousedrawn characters. An RCG file is continuously updated, "learning mousedrawing or handwriting styles along the way. Teaching students regarding neural networks is often done with the help of Recog.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Recog
Common:
Extension: