QQ NT Windows database decryption passphrase not working

[lavmaharjan]

The error message: sqlite> .open nt_msg.clean.db sqlite> pragma key = "################"; pragma kdf_iter = "4000"; ok sqlite> attach database "nt_msg.db" as plaintext key ""; Select sqlcipher_export("plaintext"); Detach database plaintext; Parse error: file is not a database (26) sqlite>

When trying with DB Browser SQLCipher, the settings kept are shown in the image below. This is also not working to open nt_msg.db even after cleaning it by removing 1024 characters.