How to add SSH known host to known host file on Windows?

known_hosts file looks not trivial. On Windows I see it contains hostname, ip address and some RSA key.

On linux I see it contains several keys separated by bar.

Who manages this file on Windows? How to add some host as "known" to this file on Windows?

Can Putty do this? If Putty has some host as known, can I copy this host record from Putty database to ~/.ssh/known_hosts on Windows?

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