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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
QWK - Extension Details
Date Added: January 01, 1970
File Extension:  .QWK
Description 1: File extension .QWK is used for a filebased offline mail reader format that was wellknown popularity among BBS (bulletin board system) users, particularly those who utilized FidoNet as well as other networks generating large mail volumes. Developed in 1987 for systems that run the noted PCBoard BBS, QWK was later modified for other platforms. At the height of BBS popularity, a few dozen offline mail readers offered support for the .QWK ZIPcompressed format.
File Type:   Archive file
Mode: Binary
Program(s) to Open:  Open with QWK Reader Message program
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