You may wanna add to the documentation that the export of the Causal Table tool is in Unicode UTF-8.
It's important to know this if the variables contain special characters. In my case I often need to model in German (Group Model Building sessions with German audience), so the variable names contain any of these: äüöÄÜÖß.
I had to try many different formats before I got it right and found when importing into Excel, I had to choose Unicode UTF-8.