This is a very old post.
For AcadE 2022, the 2 paths are
Read/Write
C:\Users\gvl\Documents\Acade 2022\AeData\en-US\Catalogs
Read-Only
C:\Program Files\Autodesk\AutoCAD 2022\Acade\UserDataCache\My Documents\Acade 2022\AeData\en-US\catalogs
I am assuming that the Read-Only location is a safeguard.
If you want to edit the wddin.xls, use
C:\Users\xxx\Documents\Acade 2022\AeData\en-US\Catalogs path.
AcadE works great with editing the Read/Write version.
The UserDataCache folder contains the data that is copied into your profile the first time you start AutoCAD Electrical on this computer.
If you create a new user on this computer, log in, and start AcadE, it will copy those files to. for example, the documents folder, so that the new user will get wddinrl.xls.