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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
ACCDT - Extension Details
Date Added: January 01, 1970
File Extension:  .ACCDT
Description 1: .ACCDT file extension is linked with Access Database Templates. This is the new MS Access 2007 .ACCDB file format. It holds the MS Jet Database engine the part of MS Access database system which retrieves and stores data in both user and system databases. It is the officespecific version of the Jet Database, also referred to as the Access Database Engine, which enables integration with MS Office Outlook 2007 and MS Windows SharePoint Services 3.0, generation of multivalued lookup fields and other enhancements.
File Type:   Database File
Mode: Binary
Program(s) to Open:  Windows: MS Access 2007
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