When opening an exported file with a single worksheet the data cannot be copied to another workbook, and you can't create a new sheet (possibly others). The error message is "This action won't work on multiple selections". I've dug around between the versions and it is caused by this line in "sheet1.xml": `<sheetViews><sheetView tabSelected="1" workbookViewId="0"/></sheetViews>` Including the above line implies multiple worksheets, and because the workbook.xml does not include a matching `workbookView` + `activeTab` element excel ties itself in a knot. To fix this we can: A) Include an element in the workbook.xml: `<bookViews><workbookView activeTab="0" /></bookViews>` or B) Change this to `tabSelected="0"`. This also appears to be a functional but feels hacky. or C) Drop the sheetViews element