They are, in fact, in flevel. touphScript can edit the 3 that exist already, which includes window XY placement data and so on. Makou can create new ones. In fact, once Makou has created new ones, tS can probably edit those too. They have the "tut.txt" extension in tS.
See the correct maps in Makou - like mds7pb1 - then tools > Tutorials / Sounds.
The menu module simply uses the data here to create the dialogue windows and initiate the options. The dialogue windows in the menu are autosized, unlike field. But they can only support single lines.
As far as I am aware, Luksy was the first to document and reverse the data.