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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
NAP - Extension Details
Date Added: January 01, 1970
File Extension:  .NAP
Description 1: The NAP file extension is associated with copyrightprotected music files from the subscriptionbased music downloads service of Napster. Jointly developed by Playmedia Systems and Napster to provide a secure music format. Music copyrights are safeguarded as it limits the type of systems where the files can be played. NAP files are much like .M4P files that are downloaded from iTunes music stores. They only differ in the encoding used.
File Type:   Audio/Music File
Mode: Binary
Program(s) to Open:  Windows: Microsoft Windows Media Player
Common:
Extension: