SQL Create table (DBF table type??)

Using the TQuery sql is there a way to create/alter dBase tables and ensure
that they will be DBaseIII  instead of "dBase for windows"?  if the table
was dBase III and ALTER TABLE is used to add coulombs the table is changed
to "DBASE for windows"
  consequently this creates problems when trying to use
"table.FieldDefs.Update" after the table has been changed.

  what am i doing wrong?  any suggestions?