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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:
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CL - Extension Details
Date Added: March 03, 2009
File Extension:  .CL
Description 1: .CL file extension is linked with Common LISP Programming. LISP is a family of programming languages that has a long history and distinctive parenthesized syntax. LISP is the second oldest highlevel programming language and it was specified in the year 1958. The most widelypopular generalpurpose LISP languages are Scheme and Common LISP.
Description 2: .CL file extension is linked with ArtIcons Pro Cursor Library. This is the file extension for the cursor library utilized by ArtIcons Pro an advanced icon utility designed for Windows. It allows amateurs and professional users to generate and edit icon images, as well as manage icon files and libraries. ArtIcons Pro is owned and developed by AhaSoft.
Description 3: .CL file extension is linked with QIP Contact List. This is the text file which contains the downloaded contacts for QIP such as names, telephone numbers, ICQ numbers, etc. QIP is freeware software for online communications. It is one of the wellknown instant messengers and is used by thousands of internet users. .CL file extension and QIP are owned and developed by Ilgam Zulkorneev.
Description 4: .CL file extension is linked with CLwin Project File. This is the file extension for the project file generated and utilized by CLwin an application that estimates the thermal loads that affect a building or a premise, and determines air conditioning characteristics such as heat output, power cooling, ventilation, battery parameters, air flow and others. The method of calculation is based on ASHRAE transfer functions. CLwin is owned and developed by ProcedimientosUno S.L.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: CLwin
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Extension: