Sorry once more, it is not possible:
"Because it is designed to develop workflows for Microsoft SharePoint Server 2010, we support
only Microsoft Visual Studio 2010 with the Microsoft .NET Framework 3.5 for developing Project Server workflows." (http://msdn.microsoft.com/en-us/library/ee767694.aspx)
Regards
Barbara
Marked as answer byWLID1966Friday, January 28, 2011 5:20 PM