Files with dun extension were used for a Dial-Up Network service in Windows OS and Internet Explorer. They include saved configuration data.

Detailed description

Software that open dun file

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DUN file extension - Dial-Up Network config file

What is dun file? How to open dun files?

File type specification:

Configuration file type icon Configuration file type

dun file icon: dun filetype icon

The dun file extension was related to a Dial-Up Network service in the Windows operating system and Internet Explorer. This service allows you to use your computer to access a network via a dial-up (phone) connection. Many different protocols are supported.

A *.dun file contains saved configuration for the dial-up network.

This dun file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Updated: February 17, 2023

The default software associated to open dun file:

Microsoft Windows icon

Microsoft Corporation logoMicrosoft Windows  Microsoft Windows software

Company or developer:
Microsoft Corporation

A family of operating systems developed by the Microsoft Corp. The first Windows was released in 1985 as a GUI add-on to MS-DOS. MS-DOS based Windows versions were developed to 2000, when was released the last version called Windows ME. Windows based on NT core started in 1993. Windows NT family are developed to these days, the latest version is called Microsoft Windows 11.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .dun file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of software applications associated to the .dun file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dun file, edit dun file, convert dun file, view dun file, play dun file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting dun files.

Settings file type for software that use dun file - Dial-Up Network config file

Programs supporting the exension dun on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Microsoft Internet Explorer for settings dun file action.

Microsoft Windows:

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