http://support.asna.com/kb/documentation/Help_Files/AVR40/AVR/Using_Winhlp32.htm
如何打开.hlp文件指定的topic
winhlp32.exe -p -N 3 C:DevWWSPCHP.WWSpcSourceHP.WWSpcClientinDebugDocsSPCEXPLORER.HLP
use HELPDECO.exe to decompile .hlp to .hpj
then open .hpj from Help & Manual get the href for topic.