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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
JRS - Extension Details
Date Added: January 01, 1970
File Extension:  .JRS
Description 1: .JRS file extension is linked with Windows Mail File. Windows Mail provides users with the latest features to help them manage the increasing volume of emails they receive in their inbox. Safety features of Windows Mail address the issues of junk and spam emails, and phishing attacks while staying connected with your friends and family.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Windows Mail
Common:
Extension: