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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
XFO - Extension Details
Date Added: January 01, 1970
File Extension:  .XFO
Description 1: Files with the .XFO extension point to forms that are formatted using the Extensible Stylesheet Language Formatting Objects (XSLFO) markup language. This filetype defines how the XML data are formatted for print, screen or other kinds of media. XFO files can be used for both online and offline program applications. XSLFO forms commonly utilize the .FO file extension.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Metafocus DIGIFORM Document Designer, Software60260XML Form Designer or Form Filler
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