Never too late to learn!

1 .xlsm文件后缀名改为.zip,解压后进入xl文件夹，找到vbaproject.bin

2  用Hex打开 vbaproject.bin 查找 44 50 42 ，将42改为78，保存

3 将扩展名改为.xlsm重新打开

Public Sub AllInternalPasswords()
' Breaks worksheet and workbook structure passwords. Bob McCormick
' probably originator of base code algorithm modified for coverage
' of workbook structure / windows passwords and for multiple passwords
'
' Norman Harker and JE McGimpsey 27-Dec-2002 (Vers[......]

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求转化矩阵（方向余旋矩阵）

二阶张量特征向量–>单位化–>P

PMP-1=M’ M’ 为对角矩阵

对角矩阵对角元素为原矩阵特征值