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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
MAG - Extension Details
Date Added: January 01, 1970
File Extension:  .MAG
Description 1: .MAG file extension is linked with Magic Mail Monitor Mailbox File. This is the file extension for the mailbox file utilized by Magic Mail Monitor a free POP3 mail monitor that supports multiple accounts. When installed, it sits on the system tray and notifies the user when new messages are in his/her email inboxes. The messages can also be previewed and deleted [if unwanted] to avoid viruses and spam. Magic Mail Monitor is owned and developed by SourceForge, Inc.
Description 2: .MAG file extension is linked with Microsoft Access Diagram. This is the diagram or chart which has been created from a Microsoft Access database. Microsoft Access is a relational database management system that is packaged with MS Office Professional. It combines relational MS Jet Database Engine with graphical userinterface. It is one of the most widelyused database applications and it contains database content, forms, tables, queries and others.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Microsoft Access
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