Thanks so much. Is there anything I can do, like try to change it into wordpad, which is what was on the Multibit video?
I mean... you can try but there is always a possibility that it might corrupt it even more if you have the original backup file/private keys try to import them to Blockchain Wallet (a random account will do) then create a new wallet on Electrum or any other wallet you wanna use and transfer the funds there.