dBASE - File Header Structure (dBASE II)

 	Offset Size	      Description

	  00   byte    dBASE version number 02h=dBASE II
	  01   word    number of data records in file
	  03   byte    month of last update
	  04   byte    day of last update
	  05   byte    year of last update
	  06   word    size of each data record
	  08 512bytes  field descriptors  (see below)
	 520   byte    0Dh if all 32 field descriptors used; otherwise 00h

	- dBASE II file header has a fixed size of 521 bytes


DBASE - File header structure (DBASE III)

 	Offset Size	       Description

	  00   byte	 dBASE vers num 03h=dBASE III w/o .DBT
			 83h=dBASE III w .DBT
	  01   byte	 year of last update
	  02   byte	 month of last update
	  03   byte	 day of last update
	  04   dword	 long int number of data records in file
	  08   word	 header structure length
	  10   word	 data record length
	  12 20bytes	 version 1.0 reserved data space
	32-n 32bytes ea. field descriptors  (see below)
	 n+1   byte	 0dH field terminator.


	- unlike dBASE II, dBASE III has a variable length header


dBASE - Field Descriptors

 dBASE II Field Descriptors (header contains 32 FDs)

 	Offset Size		  Description

	  00  11bytes	 null terminated field name string, 0Dh as first
			 byte indicates end of FDs
	  11   byte	 data type, Char/Num/Logical (C,N,L)
	  12   byte	 field length
	  13   word	 field data address, (set in memory)
	  15   byte	 number of decimal places


 dBASE III Field Descriptors (FD count varies):

 	Offset Size	       Description

	  00  11bytes	null terminated field name string
	  11   byte	data type, Char/Num/Logical/Date/Memo
	  12   dword	long int field data address, (set in memory)
	  16   byte	field length
	  17   byte	number of decimal places
	  18  14bytes	version 1.00 reserved data area