Backup can't be opened because it was unexpectedly aborted!

I’m trying to restore a full backup file .cbu 55Gb size, but when I try it sends this message:

Backup can’t be opened because it was unexpectedly aborted.

Can not pass this point. If it is not possible to restore the whole backup, is there anyway to see what is inside this file? Or a way to recover a part of it? Or open this file in anyway?

Comodo version 4.4.1.23

Any help will be welcome since there is important accounting information in it that has been lost.

Thanks in advance.