Ok to answer Simon first, I do not have that file in the directory you have shown. I looked in the responsive classic template and it is not there either.
includes\templates\[my_template]\templates\tpl_index_default.php
There is "index_categories" & "index_products" only.
And in Admin, the only thing under define page status is "define_page_not_found"
So I am missing something here I guess!
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