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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
AAR - Extension Details
Date Added: January 01, 1970
File Extension:  .AAR
Description 1: .AAR file extension is linked with Axis2 Archive file. Axis2 uses .AAR file as the Web Services deployment package. This application is formally packaged as Apache Axis2 and it is the core engine for Web services. It offers benefits and features to users such as: Streaming API for XML and own object model to achieve speed; low memory footprint; utilizes lightweight model [AXIOM] for processing extensible, highperformance and developerconvenient messaging; and many others. .AAR file extension and Apache Axis2 are owned and developed by Apache Software Foundation.
File Type:   Archive/ compressed file
Mode: Binary
Program(s) to Open:  Windows & Mac: Apache Axis2
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