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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
FI - Extension Details
Date Added: August 02, 2009
File Extension:  .FI
Description 1: .FI file extension is linked with Fortran Interface File. Fortran was originally developed by IBM for engineering and scientific applications. It is a generalpurpose, imperative, procedural programming language which is particularly suited for scientific computing and numeric computation. Fortran has been used in computationally demanding areas such as finite element analysis, computational chemistry, numerical weather prediction, computational physics and computational fluid dynamics.
Description 2: .FI file extension is linked with Gforth Forth Image File. This is the file extension of the image file utilized by Gforth a portable and fast implementation of ANS Forth language. It works with Emacs editor and offers features such as backtraces, input completion and history, decompiler, great locals facility and a manual. It combines traditional and newer implementation techniques for performance and portability.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Gforth
Common:
Extension: