A daily updated filename extension database!

DFN file extension

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

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

Table of Contents

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

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

✅ Delphi Definition File

DFN file is a Delphi Definition File. Embarcadero Delphi is an integrated development environment (IDE) for console, desktop graphical, web, and mobile applications.
DFN format description not yet available
Application: Embarcadero Delphi
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
DFN aliases:
DFN related links:
DFN related extensions:
Delphi Project

Pascal/Delphi Source Code

Delphi Compiled Unit

Delphi Form

Delphi Package

Delphi Component Package

Delphi Package Library

Borland Package Library

Borland Project Group

Delphi Component Resource

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

🚫 The .dfn file extension is often given incorrectly!

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

cfn, dbn, dcn, den, df, dfb, dfg, dfh, dfm, dgn, dn, dnf, drn, dtn, dvn

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Calamus Font Data
DRAKON Editor diagram
Delphi Form
Corel Ventura Printer Font
Paradox Table Filter
GCL Cross Referencing Data
Racelogic PerformanceBox Binary Data
TunnelCAD Input/Output File
Help and Manual eBook Template
Lightscape Parameter File

🔴 Can't open a .dfn 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 .dfn 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 .dfn file extension, write to us!

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