Identity safe, password backup file, forgotten password

I backed up my old passwords that Norton identity safe had when I switched to a new computer. I have forgotten the password associated with the back up file.

 

So I cannot restore my passwords I had. (I backed this up months ago) But haven't got around to really needing the passwords, however knowing the passwords for my most used accounts is no problem. Now I needed to restore and merge my backed up passwords for my other accounts I do not know the passwords for.

 

Is there anyway to answer or give information to get my passwords back and verify it is my backup?

 

Or is the file never going to be able to be migrated unless I remember password?