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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
ABA - Extension Details
Date Added: January 01, 1970
File Extension:  .ABA
Description 1: .ABA file extension is linked with Palm Address Book Archive. Palm Desktop for Windows is an application that allows users to add or update their contacts, memos, appointments and todo's on their computers. Palm Desktop also offers the following benefits: quick and easy installation, automatic installation, customizable userinterface, expense tracker, memo editing, customizable alarms, auto save, color theme options, tool tips, and much more. .ABA file extension and Palm Desktop for Windows are owned and developed by Palm, Inc.
File Type:   Archive/ compressed file
Mode: Binary
Program(s) to Open:  Windows: Palm Desktop
Common:
Extension: