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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
NUMBERS - Extension Details
Date Added: September 10, 2008
File Extension:  .NUMBERS
Description 1: The spreadsheet that was created with Apple Numbers has links to the .NUMBERS extension. It is a spreadsheet application program that was introduced along with the iWork 08 productivity suite by Apple. Items to be found in .NUMBERS spreadsheet files include graphs, formulas, tables, images and other sorts of data.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Macintosh: Apple Numbers (included with iWork 08)
Common:
Extension: