What is a .DUN File And How To Open It – Microsoft

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Have you came across a file with the .dun extension and you don’t know what it is? Perhaps you know what the file is, but you simply don’t know how to open it. In this article we will explain what .dun file extension is, how to open it and how to work with it.

What is a .DUN file?

The file extension .DUN stands for Dial Up Network File. The development of this file was done by Microsoft. The file is a settings related file.

What to know

There is currently 0 software that can open the .dun file on 0 platforms.


We don’t register any way of opening this file extension at the moment, kindly let us know if you have any information.