Sheet Workbook Section
Offset Size Description
0000 B 02 (no Sheet name offset) or 04 (with Sheet Name offset)
0000 Offset Offset of the Sheet Info Section
0004 Offset Offset of the Sheet Formula List
0008 Offset Offset of the Sheet Worksheet List
000C Offset Offset of the Sheet Variable List
0010 * Offset Offset of the Sheet Name Section
0014
The offset to the Sheet Name Section is only present if the first byte is 04. Perhaps this is only used if there are no graphs defined?