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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
ZIR - Extension Details
Date Added: January 01, 1970
File Extension:  .ZIR
Description 1: .ZIR is the file extension linked to the Compass and Ruler (C.a.R.) Figure. The .ZIR files have to do with the C.a.R Figure, a dynamic geometry application program. What these files basically do is stimulate compass and ruler constructions on a PC or computer system. C.a.R. is able to work on all the modern platforms. This program makes possible the easy embedding of assignments and constructions into web pages as it has been translated in several languages.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Associated application: C.A.R. from R. Grothmann
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