Hi Hanspeter,When Stardraw AV 2007 starts up it initalizes your local installation of Excel to access the External Datasource which is saved in your Stardraw installation folder as "Stardraw AV 2007 System Attributes.xls". This file is Excel 2003 .xls format.
Open the .XLS file that’s in your Stardraw installation folder (normally C:\Program Files\Stardraw.com Ltd\Stardraw AV 2007\Stardraw AV 2007 System Attributes.xls) in Excel 2007 and save it selecting “.XLS Excel 93-2003 workbook” in the Save as Type dropdown. The message should no longer appear.
I hope this is helpful.