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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
WJR - Extension Details
Date Added: January 01, 1970
File Extension:  .WJR
Description 1: .WJR refers to the file extension associated with the ReGet Deluxe data file. ReGet Deluxe is a modern download manager used in Windows Vista and XP. This data file is able to store file queue data as in Queue.wjr, configuration info as in Default.wjr, along with other information that are referenced by ReGet. The "Default.wjr file in Windows Vista installations is now found in the UserApplication Data folder. Previously it was under the Program Files directory.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: ReGet Deluxe
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