Open UDF file

UDF files: what are they and how do I open them?

Unknown file icon Are you facing difficulties opening unknown files on your computer, or wondering exactly what this file is?
We've got the information and best software solutions for opening these files effortlessly.

.udf file type #1: Universal Disk Format

You can identify disk images in Universal Disk Format by their iconic UDF extension. Often used for backup of physical dics, especially in the past.

Further details:

Universal Disk Format (UDF) is a file system specification used by optical media like DVDs and CDs.

UDF file is an image of an optical disk stored in the Universal Disk Format. These files are often used for creating bootable disks, distributing large file sets that might otherwise be broken up into multiple files, or for backing up data. They can be opened by various software programs including Nero, Roxio, and IsoBuster.

Open file with:


A virtual disk managing application for Windows

Roxio Creator NXT icon

Roxio Creator NXT

Roxio Creator is set of tools used to burn CDs, DVDs and Blu-ray discs

Roxio Toast Titanium icon

Roxio Toast Titanium

Roxio Toast 11 Titanium makes disc burning, DVD copying and video conversion as easy as drag, drop and go

Roxio Popcorn icon

Roxio Popcorn

A DVD transcoder for Mac

MagicISO icon


A powerful CD/DVD-image-file editor, CD burner, and CD/DVD-backup tool

PeaZip icon


A free open source archive utility

Virtual CD-ROM Control Panel

A disk mounting utility for Windows

Nero Classic icon

Nero Classic

A set of applications for work with multimedia files

Nero Platinum icon

Nero Platinum

HD Multimedia Software

Brasero icon


A CD/DVD burning application for Gnome

.udf file type #2: Microsoft Excel user defined function

Files with udf file extension may be also found as special user defined functions settings files for Microsoft Excel.

Further details:

The udf file extension is associated with Microsoft Excel, one of the most popular and powerful tool you can use to create format spreadsheets, graphs and much more.

The .udf files are used to store user-defined functions, which Microsoft Excel allows users to create. Using the power of Visual Basic for Applications (VBA), users can code complicated formulas only once and use them again and again in their spreadsheets and workbooks.

These functions can be used just like any built-in function already available in Microsoft Excel.

Open file with:

Microsoft Excel icon

Microsoft Excel

A popular spreadsheet application distributed with Microsoft Office suite

Microsoft Office icon

Microsoft Office

Popular and powerful office suites develeped by Microsoft

Microsoft Office for Mac icon

Microsoft Office for Mac

The latest release of Microsoft's productivity suite for Mac

Microsoft Excel for Mac icon

Microsoft Excel for Mac

A popular spreadsheet application from the Microsoft Office suite

.udf file type #3: PI Expert document

Files with udf file extension are used by the PI Expert Suite. They contain power supply specification data.

Further details:

The udf file extension is associated with PI Expert Suite, an application for Microsoft Windows that allows users to manage devices from Power Integrations' IC families.

The udf file stores document with power supply specifications.

Open file with:

PI Expert Suite

A designing tool from Power Intergrations

.udf file type #4: SQL user defined function script file

Files with udf extension are used by the Microsoft Visual Studio program. 

Further details:

The udf file extension is associated with the Microsoft Visual Studio programming and development suite for Microsoft Windows. The .udf file stores user defined function script for the SQL database.

Open file with:

Microsoft Visual Studio icon

Microsoft Visual Studio

IDE for creating programs, or websites and web applications

.udf file type #5: Uyap Dokuman Editoru document

Files with udf file extension can also be found as text documents prepared using the Turkish Uyap Dokuman Editoru software.

Further details:

The udf file extension is also related to a Turkish document editing software called Uyap Dokuman Editoru and used for one of its default file types. The software is used by National Justice Network Project.

The udf file from Uyap Dokuman Editoru contains saved document.

.udf file type #6: Windows NT/XP uniqueness database

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

Further details:

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.

Open file with:

Microsoft Windows NT 4.0 icon

Microsoft Windows NT 4.0

A business oriented Windows operating system developed in 1996

Microsoft Windows XP Professional icon

Microsoft Windows XP Professional

One of the most successful members of Windows operating system family

What is the meaning of a file extension?

File extensions are characters that appear after the dot in a computer file's name. For example, the file "unknown-file.udf" has the file extension "udf". This is used to identify which program should open the file or what file type it is.
File extensions help you organize and manage files. They provide a quick and easy way to identify and associate the file type with the appropriate software.

We can help you open your file

In our database, we have collected a huge number of different file extensions, detailed descriptions, and programs that can be used to open or otherwise work with the file extensions listed in our database.
This database is an invaluable resource for users who want to understand better file extensions and what they can do with them. It also allows users to know different file types with the same purpose.

Only verified software links are provided

We have verified every software listed in our database. The software listed in our database includes links to the developer's or software's website. These links should allow you to download the right program for each file type. Using verified software from reputable sources helps minimize the risk of malware and viruses infecting your computer.