DBFCDX and Memo Files
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     The DBFCDX driver uses FoxPro compatible memo (.fpt) files to store data
     for memo fields.  These memo files have a default block size of 64 bytes
     rather than the 512 byte default for (.dbt) files.

     DBFCDX memo files can store any type of data.  While (.dbt) files use an
     end of file marker (ASCII 26) at the end of a memo entry, (.fpt) files
     store the length of the entry.  This not only eliminates the problems
     normally encountered with storing binary data in a memo field but also
     speeds up memo field access since the data need not be scanned to
     determine the length.