if it is a .zip.aes, then that is an encrypted zip file backup... according to the multiBit HD documentation:
https://multibit.org/help/hd0.4/backups.htmlThe zip file backups are encrypted using a key generated from the wallet words... so if you don't have your wallet words, there is no way to actually decrypt those backup files
Pretty much ANY of the .aes files you can find will require either the wallet words (backup zips) or your wallet password (xxxx.wallet.aes wallet files)