Excel has an option to not display zero values (Tools -> Options -> "Zero values" checkbox, or Excel Options -> Advanced -> "Show a zero in cells that have zero values" checkbox (Excel 2007)).
When I uncheck the checkbox on my Excel sheet, I can save from Excel in xml format and the setting is retained. I can load the Excel sheet into Aspose, and the setting is retained if I save from Aspose to xls format. If I save from Aspose to xml format, the setting is not retained.
I'm attaching an Excel sheet, and the two xml outputs that illustrate this. It's not a high priority for us, but it would be nice if the setting were retained.