BCBFDGBAFCDDCFGEAFAEDAAG*(where that last letter is either an F or a G, since there's no defined path off the last page)
And if you added the numbers as specified in the directions, you get
LSOMEWHEREOVERTHERAINBOW*(where the last letter is either a Y or a Z, depending on which path you considered off of the last page).
As per the directions, if you discard the first and last letter, you are left with the answer Somewhere over the Rainbow.
thes efil enam esar eaco unte rpoi ntto thet ruet heme ofth ispu zzle augm enti ngit ssco pebu tnot lead ingt othe solu tion
or, more legibly,
These filenames are a counterpoint to the true theme of this puzzle, augmenting its scope but not leading to the solution.