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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
ICL - Extension Details
Date Added: August 02, 2009
File Extension:  .ICL
Description 1: .ICL file extension is linked with Clean File. Clean is a functional programming language that is based on the concept of mathematical functions. It is a pure functional language which gives it advantage. A function usually does not have any sideeffects and Clean functions are considered referential transparent meaning the result of the function depends on the value of the function arguments; no more, no less. .ICL file extension and Clean are owned and developed by Software Technology Research Group.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Clean
Common:
Extension: