Build 3.0.0.110 of xlsgen has a fix related to default page setup details. Whenever a XLSX file would be opened, xlsgen would default a sheet's pagesetup orientation to landscape, even though Excel actually defaults to portrait, unless the sheet is actually a chart sheet. This is an undocumented feature in Excel and was not taken into account yet. Build 3.0.0.110 of xlsgen makes sure this is the case now.