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Dial-Up Network config file
File type: Configuration file
Files with dun extension were used for a Dial-Up Network service in Windows OS and Internet Explorer. They include saved configuration data.
File type category:
Configuration file
Date updated: June 27, 2025
Record marked as obsolete and not updated for a long time.
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.
Software apps that manage or store settings in dun files:
Microsoft Windows
Software applications that handle other tasks involving dun files:
Microsoft Windows
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