How to change admin password for windows openstack instance

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Hello! When I create a windows instance I can set admin password via nova boot --meta. If I didn't use --meta admin_pass administrator password generates randomly and in that case I can't find out what is the password. Is it possible to change Administrator's password for windows openstack instance if, I can't login and change registry key? Are there any other ways to force execute set password plugin than making changes in windows registry?

Thanks!