If you wanted to open or edit IIS 7+ config files on a 64bit computer and if you try to use an editor like 32bit notepad++ then you would get a random error from windows.
The error I received was “The operation could not be completed. Unspecified error”.
Well, it turns out the reason behind this not very helpful error is that you cannot open these files using 32bit editor.
Simply use windows notepad or any other 64bit text editor.