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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
GDL - Extension Details
Date Added: January 01, 1970
File Extension:  .GDL
Description 1: .GDL file extension is linked with ArchiCAD Geometric Description Language data file. The Geometric Description Language is categorized as a binary data that may consist a few text tags. The GDL is a parametic object definition language developed by Graphisoft and it can be used in other applications. ArchiCAD is an application that allows users to create great architectural designs and achieve increased productivity. This application is designed by architects for architects. Other benefits to users include: better design focus, manage changes, evaluate design alternatives, coordination and collaboration.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Graphisoft ArchiCAD
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