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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
HA - Extension Details
Date Added: January 01, 1970
File Extension:  .HA
Description 1: .HA file extension is linked with HA Compressed Archive. It is the file or collection of files that have been compressed by HA. .HA file extension is also associated with the following applications: WinRAR [archiving and compression program] from RarLab; ZipZag [an advanced archiving program that can handle 250+ extensions]; and Total Commander [file manager for Windows] from C. Ghisler & Co., Switzerland.
File Type:   Plugin File
Mode: ASCII
Program(s) to Open:  Windows: IZArc, IZip, PowerZip, WinRAR
Common:
Extension: