I've managed to downloaded the +Lhaca application, but it's in an Asian language without the possibility of selecting another one. Because of that, I can't really say how to integrate it with Windows Live Mail since there is no other way to replace the language.
I've also searched the web, but couldn't find a solution that can be used with Windows Live Mail.
You could try the standard zipping applications and then move them to Windows Live Mail. Here are some alternatives: http://software.informer.com/search/archive