PCauthorities.com presents…
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
JAR - Extension Details
Date Added: August 01, 2009
File Extension:  .JAR
Description 1: .JAR file extension is linked with Compressed archive file package for Java classes and data. The Java Archive file format allows users to bundle multiple files into a single archived file. JAR files contain auxiliary resources and class files that are linked with applications and applets. JAR files provide security, decreased download/upload time, compression, package sealing, package versioning, and portability. .JAR file extension and Java are owned and developed by Sun Microsystems, Inc. A wellknown application associated with .JAR file extension is WinRAR from RarLab provides compression, disk space savings and costeffective transmission.
Description 2: .JAR file extension is linked with Java Archive File. This is the archive that carries multiple Java files and it is compressed using ZIP compression. It stores Java metadata and classes, and it may be digitallysigned. .JAR files run as programs if Java Runtime Environment is installed on your PC. .JAR files are utilized by Mozilla Thunderbird, Firefox, Sunbird and SeaMonkey to store addons and themes.
File Type:   Program Executable File
Mode: Binary
Program(s) to Open:  Windows: Corel WinZip, Java Runtime 1.1 or later, Web browser with Java Support; Mac: Java Runtime 1.1 or later, Web browser with Java Support
Common:
Extension: