>You can update data in old table fields, no harm for DOS; and you should not change data structure.
>
>If I need to do that - none of the tables have any primary keys - can't I just change the data structure in VFP and copy the result to TYPE FOX2X?

Absolutely. If you can't do it from DOS, i.e. Fox 2.5 is not available, then you could do it by COPY TO ... TYPE FOX2X