Files with udf file 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

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

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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.

This udf file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

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 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).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting udf files.

Programs that can create udf file - Windows NT/XP uniqueness database

Programs supporting the exension udf on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for create udf file action.

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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