remove vba project password

a link from stackoverflow, The last two steps is very important,

Or you will encounter 40230 again and again.

http://stackoverflow.com/questions/272503/how-do-i-remove-the-password-from-a-vba-project

excerpt:

• Open xls file with a hex editor. (very simple use hexedit.exe from http://www.physics.ohio-state.edu/~prewett/hexedit/)
• Search for DPB
• Replace DPB to DPx
• Save file.
• Open file in Excel.
• Click "Yes" if you get any message box.
• Set new password from VBA Project Properties.
• Close and open again file, then type your new password to unprotect.