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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:
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UDB - Extension Details
Date Added: January 01, 1970
File Extension:  .UDB
Description 1: .UDB files refer to database files that Microsoft AX business management software uses. These files contain the Application Object Server (AOS), a list of users, and the Component Object Model (COM). A .UDB file likewise includes database connections as well as the types of connections. Microsoft Dynamics AX 3.x utilizes files with the .UDB extension.
File Type:   Data file
Mode: Binary
Program(s) to Open:  Windows: Microsoft Dynamics AX
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