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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
FAX - Extension Details
Date Added: May 10, 2008
File Extension:  .FAX
Description 1: .FAX file extension is linked with Fax Document. It is the fax image from a received/created fax using a fax program. It is often saved as a .TIFF file format that most image viewing applications recognize. The standard .FAX file format is supported by various programs and it opens directly.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Windows & Mac: Any image/picture viewer which supports TIFF files
Common:
Extension: