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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
RZK - Extension Details
Date Added: January 01, 1970
File Extension:  .RZK
Description 1: An .RZK extension is associated with a File Crypt Password file. RDK files contain password info for .RZX files that are encrypted through the File Crypt freeware program. Others know File Crypt as Akte Krypta or Kriptirnik. Although File Crypt created the .RZK file format, any text editor can be used to open and edit it.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Windows: Red Zion File Crypt, any text editor
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