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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
FFO - Extension Details
Date Added: February 10, 2008
File Extension:  .FFO
Description 1: .FFO file extension is linked with Find Fast Document Properties Cache. This file carries document properties found by MS Find Fast. .FFO file may include the document information such as the title of the document and its authors name. .FFO file is generated after using Find Fast search. .FFO file is usually named "Ffastun.ffl and it is situated in the indexed hard disks root directory. .FFO files are referenced by another application and should not be manually opened.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: Microsoft Outlook, Microsoft Office applications
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