The advice is that it should be left blank, but if phpmyadmin can't find the files automatically, then the path to the files should go there.
Well, I've tried everything - every possible version of the path, and of course, empty.
I installed and uninstalled several times and with different phpmyadmin versions, and I fear that some files have remained and are confusing the program. There wasn't an uninstaller present so I uninstalled without one.
Very frustrating now because I need the program. It finds the databases, but it can't produce the tables.
However, I can see the tables and files via Command Prompt, so I know they are present.
Grateful for advice ...