SSH keys (whether the server's private key for negotiating with clients or the user's public keys used during authentication) are not stored directly inside of Serv-U. Instead, it stores the path to where the key is located on disk. So there's not really anything to export. Keys created by Serv-U use OpenSSL's default file format which is called PEM. OpenSSL command-line tools (and many other 3rd party cryptography libraries) are capable of converting this format to something else if you require it.
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