Drop your file to analyze it

UDN File

What are UDN files and how to open them

Are you having problems opening an UDN 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 UDN files.

What is an UDN file?

An .UDN file is an Alpha Four User Definition file.

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open UDN files

Important: Different programs may use files with the UDN file extension for different purposes, so unless you are sure which format your UDN file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: February 12, 2011

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 UDN file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.