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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
FFX - Extension Details
Date Added: March 11, 2008
File Extension:  .FFX
Description 1: .FFX file extension is linked with Microsoft Find Fast Index. .FFX files are searchable index of files via Find Fast a search application included in Microsoft Windows which allows users to search faster. .FFX file is also used to index all hard drive files, but particular indexes can be done via Find Fast control panel. .FFX files are also referred to as "Ffastun.ffo, and this file is located in the root directory of a particular folder, hard disk or network drive that has been indexed.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Microsoft Office applications, Microsoft Outlook
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