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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
C - Extension Details
Date Added: October 09, 2008
File Extension:  .C
Description 1: .C file extension is linked with C programming language source. It is the source code for either a C or C++ programming language. It may include an entire source code or one of the many referenced source files within a programming project. C programming source code can be edited with a basic text editor, however, syntax highlighting is absent unlike in most software development programs. .C file extension is associated with other applications such as Microsoft Visual Studio and C++ Builder from Borland Software Corp.
File Type:   Source code and script file
Mode: ASCII
Program(s) to Open:  Windows: Borland C++, Microsoft Developer Studio; Mac: Apple Xcode, Freescale CodeWarrior; Unix: GNU Emacs, vi
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