.WDN File

The wdn file extension is mainly related to one of the project-relate files from AutoCAD Electrical. 

The wdn file is a text file used specifically for auditing. In this file, terminal numbers are not checked for duplication. You can use wildcards to exclude a range of terminals for duplication checking such as all terminals with a tag name starting with "T" and with terminal number "1." AutoCAD Electrical searches for the <project_name>.wdn file in the same folder as the project definition file (.wdp). If <project_name>.wdn is not found, AutoCAD Electrical looks for the DEFAULT.WDN file in the project folder:

Windows XP:
C:\Documents and Settings\{username}\My Documents\Acade {version}\AeData\Proj

Windows 7, 8, 10:
C:\Users\{username}\Documents\Acade {version}\AeData\Proj

The default .wdn file contains the terminal number filers GND, PE, and E. They are ignored when checking for duplication and are not listed in the Electrical Audit report.

How to open:

You can view or edit these files using any text editor.

How to convert:

Probably cannot be converted to other formats.