A daily updated filename extension database!

UDN file extension

The table below provides useful information about the .udn file extension. It answers questions such as:

  • What is the .udn file?
  • What program do I need to open a .udn file?
  • How can the .udn file be opened, edited or printed?
  • How can I convert .udn files to another format?

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Alpha Five User Definition Data

UDN file is an Alpha Five User Definition Data. Alpha Five is a beginner friendly application development environment.
UDN format description not yet available
Application: Alpha Five
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
UDN aliases:
UDN related links:
UDN related extensions:
Lotus Approach 97 Document

Microsoft Access Database

SlamDB Database

Alpha Five Set Index

Alpha Five Set Object

Resort Software Database

General Database File

Pervasive SQL Database

Alpha Five Database

Alpha Five Library

Other types of files may also use the .udn file extension.

🚫 The .udn file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

dn, dun, idn, ucn, ud, udb, udg, udm, und, urn, uvn

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Adobe Dimension Model Data
uDraw Graph Data
Dial Up Networking Exported Settings
MapView User Defined Module
Alpha Five Index Definition File
MOUSE Urban Network Datafile
Unisys U-ACT Configurator Data
H3DAPI Uniform Resource Name Data
OmniPage User Dictionary
Yamaha Tyros Audio

🔴 Can't open a .udn file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .udn file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .udn file extension, write to us!

🔴 Rate our UDN page

Please help us by rating our UDN page on a 5-star rating system below. (1 star is poor, 5 star is excellent)

4 of 5 stars (21 votes)
Thanks for voting!
Invalid vote.
Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
This page is available in the following languages: Český Deutsch English Español Suomi Français Magyar Italiano 日本語 Nederlands Norsk Português Român Русский Svensk 中文