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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
XFT - Extension Details
Date Added: January 01, 1970
File Extension:  .XFT
Description 1: The form Adobe Form Designer 5 or its older version FormFlow Designer 99 (also called Accelio Capture FormFlow Designer) created, are tied with the .XFT file extension. JetForm Corporation is the original firm behind FormFlows development. The company later changed its name to Accelio, and was then bought by Adobe Systems. Soon after, Adobe released a new version of the program software which it named Adobe LiveCycle.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Adobe Designer or LiveCycle
Common:
Extension: