Hello,
1st, thanks for the nice comments !
And so yes, you have explanations in the file Data\HowToMod.html , and the Tour schedule is in Data\Tour.Ini .
If u want to be able to play in parallel your modified Tour and the original one, then yup, you have to install the game twice, in 2 different directories.
If you just want to do a backup, then just backup the files before to modify them.
Regards,