I hava an application that currently uses the Copy and Past API with FILECONTENTS and FILEGROUPDESCRIPTOR.
This works normaly without a problem. Unfortunatly this approach fails if the path + the filename specified in FILEGROUPDESCRIPTOR excedes the maximal path lenght.
I also have noticed that Outlook (which uses the same approach) has the same problem.
I'm working on an Windows Explorer Namespace Extension. Does someone know an alternative to this approach.