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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
UTF8 - Extension Details
Date Added: January 01, 1970
File Extension:  .UTF8
Description 1: The .UTF8 extension is tied with Unicode UTF8Encoded Text. It is a text document using Unicode UTF8 encoding, the 8bit Unicode Transformation Format. Aside from English, UTF8 files can also be used for other languages. UTF8 files offer support for Asian characters and is known to be backwards compatible with the ASCII.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Mac and Windows: any text editor or web browser
Common:
Extension: