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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
WKS - Extension Details
Date Added: January 01, 1970
File Extension:  .WKS
Description 1: .WKS is the extension tied with the spreadsheet that the Microsoft Works spreadsheet program created. This file has data organized in columns and rows. The MS Works is considered the streamlined version of the MS Office. Not all features available in the different Office programs are included in MS Works.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Excel or Microsoft Works Macintosh: Microsoft Excel
Common:
Extension: