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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
JSFL - Extension Details
Date Added: April 11, 2008
File Extension:  .JSFL
Description 1: .JSFL file extension is linked with Flash Javascript File. .JSFL files are utilized to add functionality using the Flash Authoring environment. These files carry Javascript codes and can access Flash Javascript API. Adobe Flash is an advanced authoring environment for developing digital experiences, mobile content and interactive websites. .JSFL file extension and Adobe Flash are owned and developed by Adobe Systems Inc.
File Type:   Source Code and Script File
Mode: ASCII
Program(s) to Open:  Windows & Mac: Adobe Flash
Common:
Extension: