Excel import questions

Hey Guys, I have two questions about the Excel Importer. The first one is: -How do I validate the Excel Document that was send it to me? When I try to Import the Template from the Excel file I get the error from the image bellow: -- When I open the file and save it as Xlsx, all works out fine, even if the one I tried to import was already a Xlsx file. -How do I get the Import component to work faster? It has almost a thousand rows in it and is taking it almost one hour to import.   Thanks guys.
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