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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
A4W - Extension Details
Date Added: January 01, 1970
File Extension:  .A4W
Description 1: .A4W file extension is linked with the Disk Image Format. The image has 143388 bytes and it is solely used under the propriety of Apple II Emulator for Windows. According to the help file of Apple II Emulator for Windows, the disk image format adds a separate file header from the disk image data section by 2 bytes with 1Ah [value 26]. None copyprotected images are stored by the binary format. .A2W file extension is also associated with Apple2 Oasis. .A2W file extension and Apple II Emulator for Windows are owned and developed by Apple, Inc.
File Type:   Disk Image [ISO] Binary File
Mode: Binary
Program(s) to Open:  Windows: Apple II Emulator
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