Answers:
check on the site u get it from sometimes they enjoy a password inventory I don`t know on a related forum ... u could try googling the filename+password ... and sometimes the password is the filename or division of it ...
There are brute force password crackers for that.
But depending on down the password it could transport weeks to find it.
That's glib. You can't!
you can't !
There are programs to find rar and fastener passwords but they are not 100% reliable. Personally, I wouldn't bother.
Well, to be honest you can do tremendously little just about it. However, individual if the background belongs to you. Then you might economically use a winzip software. :)