>I have a VFP application that needs to write to Fox 2.6 tables. Is this OK to do or will it corrupt the tables on the 2.6 side?

To go further with what Kevin said, you can even modify the table structure without doing harm as long as you don't add any VFP-specific features or join the table to a DBC. Finally, you can always COPY TO MyTable TYPE FOX2X to restore a table to the earlier format.