If you are setting up Windows Live Mail on a new computer and you want to transfer your blocked senders list or safe senders list and you are using IMAP or POP the list will be here.
Navigate to[HKEY_CURRENT_USER\Software\Microsoft\Windows Live Mail\Rules]
Just right click on Rules and export to a place where you know where it is
Transfer the file to your new computer and just run the file. All your rules will be there.