Information about each list can be found within the relevant text file contained in the zip
There are two versions for each setting; the normal version uses the subdivision by provider ( fake satellites), i.e. each provider ( Rai/Mediaset, Italian etc.) is seen as a satellite and appears in the sat list ( Group button) simplifying navigation in the list.
The version whose name ends with _1 and the one without subdivision by providers, i.e. with only the two satellites HotBird and Astra 1.