File Extension DFN

By:   |   Revised: November 26, 2018

Microsoft Silver

DFN File Summary

The DFN File Extension has one primary file type, Delphi Definition Data format, and can be opened with two distinctive software programs, with the dominant related application developed by Embarcadero Technologies (RAD Studio software). The majority of DFN files are considered Settings Files.

The DFN File Extension can be viewed on the Windows, Mac, and iOS operating systems. They are supported on both desktop and mobile devices. DFN files have a "Low" Popularity Rating; this means that they are not present on most devices.

If you are having problems opening DFN files, or would simply like to learn more about the software programs and developers that are associated with them, please see the complete information contained below.

Low
Popular
5379
Ranking

/ 11690

Active

State

26

November

2018

Revised

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Kinds of DFN Files


Dominant DFN File Type

.DFN
File Name:.dfn
Classification:Delphi Definition Data

The file stores definitions for Delphi; an agile Object Pascal development environment and component library for cross-platform native applications development.

Author: Embarcadero Technologies
Division:Settings Files
Location: HKEY_CLASSES_ROOT\.dfn

Software Programs That Open The Delphi Definition Data:


RAD Studio by Embarcadero Technologies

Windows
Mac
iOS
Android
Linux

Delphi (IDE) by Embarcadero Technologies

Windows
iOS
Android
OS X El Capitan

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DFN File Popularity


Popular Devices

Desktop (84.34%)
Mobile (14.29%)
Tablet (1.37%)


Sources of DFN Problems


Typical DFN Opening Challenges

RAD Studio Not Present

Double-clicking your DFN file prompts the message "%%os%% Can't Open DFN File". When this happens, it is commonly due to RAD Studio missing in %%os%%. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.


Tip: Another DFN-related program can be selected to open the file by clicking "Show Apps" and finding the application.


Outdated RAD Studio

Occasionally, you might have an outdated version of RAD Studio installed that's incompatible with your Delphi Definition Data type. Download the latest RAD Studio version from the Embarcadero Technologies website to ensure you have the correct one installed. Most of the time your Delphi Definition Data file was created by a newer RAD Studio than what you have installed.


Tip: Sometimes you can get a clue about the version of DFN file you have by right clicking on the file, then clicking on "Properties" (Windows) or "Get Info" (Mac OSX).


Summary: Not having the right RAD Studio version on your computer can cause problems opening DFN files.


Other Causes of DFN File Opening Problems

You can still experience errors opening DFN files even with the latest version of RAD Studio installed on your PC. If you are continuing to have errors with loading DFN files, other external issues might be to blame. These other problems include (listed in order from most to least common):

  • Invalid DFN file references in the Windows Registry (the "phonebook" of the Windows Operating System)
  • Accidental deletion of the description of the DFN file in the Windows registry
  • Invalid installation of a DFN-associated program (eg. RAD Studio)
  • DFN file corruption
  • Malware-tainted DFN file can't be opened
  • Hardware associated with DFN has outdated drivers
  • Your PC doesn’t have enough available resources to open the Delphi Definition Data file

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