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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
NCF - Extension Details
Date Added: January 01, 1970
File Extension:  .NCF
Description 1: NCF stands for No Cache File. The .NCF extension is attached to cache files that the Valve Steam game development program uses. Such files are referenced each time the Valve software is updated. Although quite similar to .GCF files, .NCF files do not contain info that have to do with internal data storage.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: Valve Steam or GCFScape
Common:
Extension: