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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
JP2 - Extension Details
Date Added: September 02, 2009
File Extension:  .JP2
Description 1: .JP2 file extension is linked with JPEG2000 image format which is based on stateoftheart wavelet compression. This application offers lossy and lossless compression, and provides smaller file sized, high quality images. .JP2 file extension is associated with other applications such as ACDSee 10 Photo Manager from ACD Systems International Inc., XnView from Pierre.e Gouqelet, Free PDF Converter from Baltsoft Software, and NERO from Nero AG.
Description 2: .JP2 file extension is linked with Jeoparty II Presentation File. This is the file extension for the presentation file created/utilized by Jeoparty II an entirelyfree computer application that is modeled after the television program Jeopardy. It is intended to provide students a fun review experience and it has a teacherled presentation. The prompts are formatted just like the game Jeopardy, and the program tracks the teams scores and it also provides additional advanced features for teachers and students to enjoy. Jeoparty II is owned and developed by Matthew Hagaman.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: Jeoparty II
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