>I'm not sure I understand about the SSIS package. Does it apply here? The VFP apps I write don't have VFP data. They use either SPT or remote views to access SQL data. I'm hoping as much as possible about this hardware upgrade will be largely transparent--at least after the pain of reinstalling and/or restoring everything has passed.

You don't need anything special for using SQL Server 64 bit from VFP. SPT works fine. You need SSIS package if you want to access VFP data from SQL Server 64 bit as the other ways listed at this page
http://fox.wikis.com/wc.dll?Wiki~VisualFoxProDataFromSQLServer~VFP

will not work for 64 bit version of SQL Server.