Format of WORKGRP.SYS entry point record:
Offset	Size	Description	)
 00h	WORD	3633h  \ signature???
 02h	WORD	EF6Fh  /
 04h	DWORD	address of entry point (see #01486)
Note:	first four bytes of buffer must be 6Fh E9h 33h 36h on entry when using
	  IOCTL rather than READ to get the entry point record