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Informations about the DFN filename extension and the file formats associated with it

We collected the information you should know about the .dfn filename on this page. If you were sent a(n) .dfn file in an e-mail, but you don’t know what to do with it, then you can find help here. We strive to suggest free, open-source applications that are available to everyone for the file formats.

1 filename extension(s) are in our database

.dfn - Delphi Definition File

The DFN file is a Development file, which is connected to the Delphi Definition File according to our registry. With the adequate settings, the Delphi Definition File (.dfn) files can be opened or converted with the help of Embarcadero Delphi.

Format description:
DFN format description not yet available
Embarcadero Delphi
Magic string:
- / -
Related links:
Related extensions:
Borland Project Group
Borland Package Library
Delphi Component Package
Delphi Component Resource
Delphi Component Template
Delphi Compiled Unit

Important! Programs other than the ones listed above may also use the .dfn file extension. Even harmful programs can create files with the .dfn extension to store data in them. Always be careful with .dfn files coming from unknown sources. Don’t open executable files that arrived in mails, even if you know the sender.

The .dfn file can’t be opened on your computer?

If the program necessary for opening the .dfn file is installed properly on your computer, then the quickest and simplest way to open the .dfn file is to double-click on the file’s name. If that doesn’t work, then the right software probably isn’t installed on your computer.

While opening the .dfn file, you may receive an error message from the associated application, this can be caused by the following:

Incorrectly given .dfn extension

The .dfn filename extension can be given incorrectly sometimes. The cause of the error could be a mistake or a simple typo. We found the following incorrectly given filename extensions that are the most frequent in the case of .dfn files.

sfn, cfn, fn, dvn, drn, dgn, dfh, dfb, xfn, den, vfn, dbn, rfn, ffn, dtn

Maybe you’re not even looking for the .dfn file extension?

It’s possible the the file’s extension was given incorrectly. Below, we list some filename extensions that are similar to the .dfn extension. It’s possible that the one you’re looking for is among them.

Calamus Font Data
Kissock EModel Data Variables
Help and Manual eBook Template
Paradox Table Filter
Stronghold 3 Game Data
Racelogic PerformanceBox Binary Data

Associated applications

The Windows operating system stores information about the applications associated to the file extensions in the registry database. The associations can be queried or modified in the Command Prompt window with the "assoc" command.

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We gladly accept application suggestions, but our primary goal is to suggest reliable, open-source applications that can be freely distributed to the users.

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