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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
NES - Extension Details
Date Added: January 01, 1970
File Extension:  .NES
Description 1: .NES is a file extension that has links to the Nintendo (NES) ROM filetype. NES is short for Nintendo Entertainment System. These files feature ROM images of a NES videogame. Containing the same data as the NES cartridge original, users can play NES files on both PCs and Mac computers, provided they have NES emulation software on hand.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: FakeNES, FCE Ultra, Jnes, NesterJ, Nestopia, VirtuaNES, other NES emulator Macintosh: iNES, Nestopia, RockNES, other NES emulator
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