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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
ACCDB - Extension Details
Date Added: January 01, 1970
File Extension:  .ACCDB
Description 1: .ACCDB file extension is linked with Office Access 2007 Database File Format. This file extension takes over .MDB file extension for the new Office Access 2007 purposes. 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:   Database File
Mode: Binary
Program(s) to Open:  Windows: Microsoft Access
Common:
Extension: