keys format is like this
K-56GF-AHSI-
S-FDHF-FH67-
i'll pay .5 btc if my funds gets recovered
If you have the wallet file password, you can use the 'export private keys' feature that is available in the wallet tools tab. You must enter the wallet decryption password and a new password to protect this file, leave without the password (so the file is readable).
This way you can import into wallets like Electrum, Bitcoin Core, Bluewallet etc.
What is very strange is that if I search on Google for multibit classic, I find several sites with beautiful UI Design for such an old wallet, in any case, never download this wallet from sites like this, go directly to github, otherwise, If it's phishing you end up losing all your coins.