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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
NFO - Extension Details
Date Added: September 10, 2008
File Extension:  .NFO
Description 1: .NFO is a file extension linked to text files that contain info on pirated software programs (warez). These files include release notes and often identify what piracy group is responsible for the softwares distribution. .NFO files are generally saved together with the program and its related files. In the process of opening the file, Windows might try using Microsoft Help application, though unsuccessfully. Attempt opening .NFO files directly with a text editor like TextEdit for Macs and Notepad for Windows PCs.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Mac and Windows: any text editor
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