Format of OS/2 Extended Attribute data (struct FEA):
Offset	Size	Description	)
 00h	BYTE	flags
		bit 7: critical EA
 01h	BYTE	length of Extended Attribute name (excluding terminating NUL)
 02h	WORD	length of Extended Attribute value
 04h  N BYTEs	EA name
	BYTE	00h
      M BYTEs	EA value