fzputtygen is part of FileZilla. It is used to convert private keys from OpenSSH or ssh.com format into a format understood by fzsftp. It usually gets called by FileZilla and is not intended to be used directly.
fzputtygen is based on the puttygen component of PuTTY.
Please visit https://filezilla-project.org/ for further information. Report bugs only if you are using the latest version available from the FileZilla website.
Copyright (C) 2004-2018 Tim Kosse
Copyright (C) 1997-2018 Simon Tatham and the PuTTY team
FileZilla is distributed under the terms of the GNU General Public License version 2 or later.