Setting Spreadsheet control data source to Excel file

[Lyndsey]

I am trying to use either the Excel spreadsheet (as an
insertable object) or the spreadsheet web control to load
the contents of an Excel file. I then need to save the
changes made in the spreadsheet control back into the
file. This must include all formatting as well as text.

Can anyone help me with this? I have not been able to
find a way of setting the source of the control to an
Excel file, but surely this is possible!?