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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
FCD - Extension Details
Date Added: January 01, 1970
File Extension:  .FCD
Description 1: .FCD file extension is linked with Virtual CD Format. It is the uncompressed CDROM image created using Virtual CD versions 1, 2 and 3. .FCD files are supported by later versions of Virtual CD; however, these files are saved with a different format. .FCD file extension is associated with PowerISO DirectAccessArchive from PowerISO Computing Inc., UltraISO from EZB Systems Inc. and ISOBuster from Smart Projects.
File Type:   Disk Image [ISO] Binary File
Mode: Binary
Program(s) to Open:  Windows: EZB Systems UltraISO, H+H Software Virtual CD, ISOBuster
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