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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
ZDB - Extension Details
Date Added: January 01, 1970
File Extension:  .ZDB
Description 1: The file extension .ZDL is linked to DesignPro Label Design. This Avery DesignPro Label Design extension is used in customizing and printing of labels, tshirt transfers, dividers, business cards and more that have a professional look. Older DesignPro versions as in the version 4 made use of and bore the file extension .ZDB.
Description 2: The US military and Department of Defense for Electronic Personal Security Questionnaire (EPSQ) documents use the encrypted file format bearing the .ZDB extension. This format is often seen on the Standard Form (SF) 86 Questionnaire, the one utilized by government employees, military personnel as well as government contractors when applying for Security Clearance.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: DoD EPSQ
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