Export to .xls is correct, but gives an error message afterwards
Wrong-XLSX-export-of-stacked-graph.xls (application/vnd.ms-excel), 12.50 KB, created by Gerry on 2015-09-25 06:13:47 UTC
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Creator: Gerry
Created: 2015-09-25 06:13:47 UTC
Size: 12.50 KB

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