Unless you have the source code to make changes, no, I seem to have by
default not included any sheets that are hidden. It made sense to me
at the time, as I can't come up with a valid reason why someone would
be sending you data that you need on a sheet that they've hidden, but
I guess I can see the possibility of a setting to go ahead and include
them. I'd then probably need a property to say whether each sheet was
of type hidden or not.
Bruce Dunwiddie