Format of Btrieve parameter record:
Offset	Size	Description	)
 00h	DWORD	pointer to data buffer
 04h	WORD	data buffer length
 06h	DWORD	pointer to 90-byte record containing positioning info
		(should be same for all calls for same file)
 0Ah	DWORD	pointer to 38-byte FCB info buffer
		(should be same for all calls for same file)
 0Eh	WORD	function code (see #03841)
 10h	DWORD	pointer to file name/key buffer
 14h	BYTE	key length
 15h	BYTE	key number
 16h	DWORD	pointer to status code (see #03842)
 1Ah	WORD	interface code (version specific)
		6176h version 5.10