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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
JSOBJ - Extension Details
Date Added: April 02, 2009
File Extension:  .JSOBJ
Description 1: .JSOBJ file extension is linked with Opera File. This is the file extension utilized by Opera Web Browser a web browser and internet suite that handles common internetrelated tasks [i.e. displaying web sites, IRC online chatting, downloading files, sending and receiving emails, reading web feeds and managing contacts. Opera is free for PCs and mobile phones only.
File Type:   Internetrelated File
Mode: ASCII
Program(s) to Open:  Windows & Mac: Opera Web Browser
Common:
Extension: