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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
BAV - Extension Details
Date Added: January 01, 1970
File Extension:  .BAV
Description 1: .BAV file extension is linked with AVG AntiVirus The Bat! Plugin File. This is the plugin file developed by RITLABS for AVG AntiVirus. .BAV file provides email spam protection and other email features. It is similar to "The Bat program, but it functions within the AVG AntiVirus interface. .BAV file extension is referenced by another program and should not be manually opened.
File Type:   Plugin File
Mode: ASCII
Program(s) to Open:  Windows: AVG AntiVirus
Common:
Extension: