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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
NOW - Extension Details
Date Added: January 01, 1970
File Extension:  .NOW
Description 1: .NOW is the file extension tied to a Readme file. It is attached to text documents containing crucial info on a software or program update. NOW files usually have a list of new features or installation instructions included with the update. "readme.now is the name often given to a .NOW file.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Mac and Windows: any text editor
Common:
Extension: