The final step didn't work.
It looks like this:
C:\Users\SYSMKW>cst.exe -e OP01.cst
Usage of cst.exe:
-cp string
the code page used in txt (default "932")
-cst string
specify the cst name
-e extract cst to txt
-o string
output file name(txt or cst)
-p pack txt to a cst
-txt string
specify the txt name(used in pack)
But did't take out txt.