Files with udf extension can also be found as Uniqueness Database Files from Windows NT/XP. Used for administrative purposes.

There are 5 other file types using
the UDF file extension!

udf icon.udf - Microsoft Excel user defined function file

empty icon.udf - Uyap Dokuman Editoru document

empty icon.udf - SQL user defined function script file

empty icon.udf - Universal Disk Format image

empty icon.udf - PI Expert document file

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UDF file extension - Windows NT/XP uniqueness database

What is udf file? How to open udf files?

File type specification:

System file type icon System file type

udf file icon: udf filetype icon

The udf file extension is also related with Uniqueness Database Files (UDFs).

UDF has a structure similar to that of an answer file. However, the UDF begins with an additional section in which uniqueness IDs are specified and mapped to sections in the UDF. If a uniqueness ID is specified in the winnt or winnt32 command, any values specified in the sections associated with that uniqueness ID override the values in the sections in the answer file that have the same section names.

One UDF can have numerous uniqueness IDs, and each uniqueness ID can specify a slightly different configuration. For example, you can have a uniqueness ID for each computer in your organization, with a different computername for each uniqueness ID— all in one UDF.

The default software associated to open udf file:

Microsoft Windows NT 4.0 icon

Microsoft Corporation logoMicrosoft Windows NT 4.0  Microsoft Windows software

Company or developer:
Microsoft Corporation

Microsoft Windows NT 4.0 is popular business oriented operating system released in 1996. It is full 32-bit operating system based on NT core. Windows NT is designed to work on multi-processor computers. The graphical environment is similar to Microsoft Windows 95. Windows NT 4.0 were distributed in two editions: for workstations and servers. In 2000 Windows NT was replaced by the Microsoft Windows 2000.

Microsoft Windows XP Professional icon

Microsoft Corporation logoMicrosoft Windows XP Professional  Microsoft Windows software

Company or developer:
Microsoft Corporation

Microsoft Windows XP Professional operating system is designed for business and advanced users released in 2001. It contains all functions from Windows XP Home as well as other advanced functions used in business sector. It is available to buy in 32-bit and 64-bit version. The official support for this OS ends in 2014.

Help how to open:

Can be viewed using any text editor.

How to convert:

This file type is not meant to be converted to anything else.

Related links:

UDF on Microsoft Technet

List of recommended software applications associated to the .udf file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open udf file, edit udf file, convert udf file, view udf file, play udf file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with udf file - Windows NT/XP uniqueness database

Click on the software link for more information about Microsoft Windows NT 4.0. Microsoft Windows NT 4.0 uses udf file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Microsoft Windows:

Main software associated with udf file by default:
Microsoft Windows NT 4.0 small icon Microsoft Windows NT 4.0
Microsoft Windows XP Professional small icon Microsoft Windows XP Professional

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