Format of record3:
Offset	Size	Description	)
 00h  2 BYTEs	???
 02h	WORD	???
 04h	WORD	size of ES:DI buffer
 06h	WORD	???
 08h	WORD	operation number (for function 0401h)
 0Ah	DWORD	-> ???
 0Eh	WORD	(ret) ???
 10h 12 BYTEs	???