.NET Portability Analyzer extension https://visualstudiogallery.msdn.microsoft.com/1177943e-cfb7-4822-a8a6-e56c7905292b API Portability Analyzer – Alpha (command-line version) http://www.microsoft.com/en-us/download/details.aspx?id=42678 PLIB API XLS ...

My contribution to: http://stackoverflow.com/questions/14109102/how-do-i-add-a-worksheet-after-all-existing-excel-worksheets   Seems Worksheets property is read-only Returns a Sheets collection that represents all the worksheets in the specified workbook. Read-only Sheets object. ...