开发XLSB读取应用遇MS-XLSB未记录字节段的技术咨询

我正在开发一款读取XLSB文件的应用，以MS-XLSB规范文档作为参考。当前核心目标是读取工作表的CELLTABLE，这需要先解析其前置结构，目前已完成BrtWSDim记录的读取。但我发现格式中有两段字节未在规范中记录（已标注为“reserved (undocumented)”），希望了解获取这些未记录区域相关信息的途径。

具体字节信息如下（所有比特/字节以小端序显示）：

A - fShowAutoBreaks (1比特): 1  
B - reserved1 (2比特): 00  
C - fPublish (1比特): 0  
D - fDialog (1比特): 0  
E - fApplyStyles (1比特): 0  
F - fRowSumsBelow (1比特): 0  
G - fColSumsRight (1比特): 1  
H - fFitToPage (1比特): 1  
I - reserved2 (1比特): 0  
J - fShowOutlineSymbols (1比特): 0  
K - reserved3 (1比特): 0  
L - fSyncHoriz (1比特): 0  
M - fSyncVert (1比特): 0  
N - fAltExprEval (1比特): 0  
O - fAltFormulaEntry (1比特): 0  
P - fFilterMode (1比特): 0  
Q - fCondFmtCalc (1比特): 0  
reserved4 (6比特): 000000  
brtcolorTab (8字节): 1100100110000000110001001001001100100000010000000000000000000010  
reserved (undocumented) (6字节): 000000000000000000000000000000000000000000000000  
rwSync (4字节): 11111111111111111111111111111111  
colSync (4字节): 11111111111111111111111111111111  
strName.cchCharacters (CodeName): 01100000000000000000000000000000 载荷: Sheet1
reserved (undocumented) (3字节): 001010011000000000001000  
brtWsDim.rwFirst (4字节): 00000000000000000000000000000000 整数值: 0  
brtWsDim.rwLast (4字节): 01000000000000000000000000000000 整数值: 2  
brtWsDim.colFirst (4字节): 00000000000000000000000000000000 整数值: 0  
brtWsDim.colLast (4字节): 01000000000000000000000000000000 整数值: 2  

内容的提问来源于stack exchange，提问作者George