Exactly 11 years ago KyPass began to support Key File Version 1.0 https://www.kyuran.be/blog/2011/07/10/keyfile-support-in-1-3/
During this time, KeePass has long recommended using version 2.0 already

But the current version of KyPass 5.6 does not support working with key files of version 2.0, and works only with the old version 1.0
Could you please add version 2.0 to support at last? It would be very relevant. Thank in advance 🙏