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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
JNLP - Extension Details
Date Added: October 09, 2008
File Extension:  .JNLP
Description 1: .JNLP file extension is linked with Java Web Start file. JNLP stands for Java Network Launching Protocol, and it is formatted in XML. This file is used for managing and launching Java programs on the internet or as standalone application through a network. Java Web Start guarantees that the latest and correct version of the application as well as Java Runtime Environment is up and running in your computer. .JNLP file extension and Java are owned and developed by Sun Microsystems, Inc.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows, Mac & Unix: Java Web Start or any supporting Web browser
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