When you paste Excel worksheet with menu edit, paste special,
you can open the embeded worksheet with Excel application by the menu Edit,
Worksheet Object, Open.
But this operation fails in each two or three times, and you recieve error
message like "An error (1415) occurred during the action Open Object."
In Visio2003 it fails ieach three times.
In Visio2007 each two times.
This can be soved, if you save the drawing as previous version, let say save
as Visio2002, and open again. It is documented in MSDN at