UDF File

What are UDF files and how to open them

Are you having problems opening an UDF file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your UDF files.

What is an UDF file?

UDF files have multiple uses, and User Defined Function for Excel is one of them. Read more about the other uses further down the page.

User Defined Function for Excel

Also known as user-defined function files, these UDF files are generated by Microsoft Excel when users create custom formulas for their spreadsheet documents. Microsoft Excel provides VBA (Visual Basic for Applications) support. This allows users to develop custom functions and formulas for their spreadsheets.

Users can access previously saved formulas and functions through these UDF files to use them across multiple spreadsheets without the need to code the functions and formulas again manually. The content of a .udf file is used by Microsoft Excel whenever a user opens and edits a spreadsheet with custom functions and formulas that have been saved in the UDF file. The data in a .udf file is also updated by Microsoft Excel when the user changes the saved formulas and functions of the spreadsheet.

How to open UDF files

We have identified one UDF opener that is compatible with this specific type of UDF file.

Programs that open User Defined Function for Excel files

Last updated: January 22, 2025

All known file formats using extension .UDF

While User Defined Function for Excel is a popular type of UDF-file, we know of 4 different uses of the .UDF file extension. Different software may use files with the same extension for different types of data.

Universal Data Format

We know that one UDF format is Universal Data Format. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

UDF opener for Windows

We have identified one UDF opener that is compatible with this specific type of UDF file.

UYAP Document Format

We know that one UDF format is UYAP Document Format. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different UDF openers which you will find listed below.

X-ray Diffraction Data File Format

We know that one UDF format is X-ray Diffraction Data File Format. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Various apps that use files with this extension

These apps are known to open certain types of UDF files. Remember, different programs may use UDF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about UDF file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.