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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
AJL - Extension Details
Date Added: November 01, 2009
File Extension:  .AJL
Description 1: .AJL file extension is linked with CA ARCserve Backup Journal File. This file extension usually contains the summary of an ARCserve task. The files can be located in the log directory. CA ARCserve Backup is a reliable, enterpriseclass data protection application for various hardware and software platforms. It uses single, easytouse interface that enables multitiered protection that is driven by business policies and goals. .AJL file extension and CA ARCserve Backup are owned and developed by Computer Associates International Inc.
File Type:   Backup File
Mode: Binary
Program(s) to Open:  Windows & Mac: CA ARCserve Backup
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