Is it still possible to recover Multibit Classic wallet from multibit.key file? I have the file mulibit.key (long string starting with U2FsdGVkX19E+pw) and password.
Cannot find the Multibit Classic wallet to import the key and export to Electrum...
Tried to decrypt the key with
openssl enc -d -p -aes-256-cbc -a -in multibit.key -out key.txt -pass pass:Mypassword
but got only such response:
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
salt=44FA9C205936F29D
key=8E260D08EE31BB97AB7544D70BC41535369
iv =B6B2A8A90712B2393DDF8
bad decrypt
140404139345280:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:crypto/evp/evp_enc.c:588

EDIT WITH FULL ANSWER:
The problem was different version of open ssl... After adding flag -md md5 my multibit.key get encrypted! So I could enter the private key into Electrum wallet
openssl enc -d -p -aes-256-cbc -md md5 -a -in multibit.key  -out key.txt  -pass 'pass:myPassword'
did you try the -md5 flag, the openssl decryption changed a few years back and the md5 flag should solve it