Index.html - lower case i not saving correctly

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I'm having trouble with my navigation buttons not saving my homepage link as
index.html. (lowercase i).
When I click on the button's hyperlink properties, the name is saved as
Index.html (with an uppercase I), which in turn does not find my correctly
named index.html page.
Even if I rename the link back to lowercase i, it just saves it with an
uppercase I again.
This happens on all my web pages, with their "Home" buttons.

Is there a simple solution to this, rather than wiping my site clean and
starting all over again?

Any help would be appreciated!

Thank You
.

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