Advantage Error Guide
An invalid table type was specified. Valid choices are ADS_CDX, ADS_NTX, ADS_VFP or ADS_ADT. The table type must support the memo file type to be opened, if applicable. The ADS_ADT table type supports ADT tables, ADI indexes, and ADM memos. The ADS_CDX and ADS_VFP table types support DBF tables, CDX and IDX indexes, and FPT memos. The ADS_NTX table type supports DBF tables, NTX indexes, and DBT memos.
The ADS_VFP table type is a superset of the ADS_CDX type. If a DBF table contains field types such as Timestamp (DateTime), Currency (Money), VarBinary, etc., you must use table type ADS_VFP to open it.