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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
ZDC - Extension Details
Date Added: January 01, 1970
File Extension:  .ZDC
Description 1: .ZDC is the file extension associated with the files catalog that the file cataloging tool CD Catalog Expert created. It is used for storing references to files that are found on computers hard drives, DVDs and CDs as well as other types of disks. The format is able to store a list of files together with related info like user descriptions for each of the files. "Default.zdc is the standard name carried by a CD Catalog Expert catalog file.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Zero2000 CD Catalog Expert
Common:
Extension: