Creating an AutoInc field in Paradox tables programmatically

I've been trying to create Paradox tables from field and index
definitions of another Paradox table. I can create the table, it has the
fields and can even copy the required records. However, in the creation
of the table the AutoInc definition has been lost. For some reason the
field has been converted to an Integer? Any ideas how I can keep my exact
table defintion. I've used "FieldDefs :=" and "Assign( t.IndexDefs )".