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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
RK - Extension Details
Date Added: January 01, 1970
File Extension:  .RK
Description 1: The .RK file extension is tied to the WinRK File Archive. It refers to compressed archive files that are created using WinRK. RK files make use of FPW, PWCM, ROLZ3 and ROLZ2 compression along with other proprietary compression algorithms. A .RK file also sometimes incorporates .PAQ7 file compression techniques or methods.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: M Software WinRK
Common:
Extension: