mysqld --install without any parameters.
In such case, service name is always MYSQL, as service
binary path is "path\to\mysqld.exe" "MySQL". Guess data
directory it is either from my.ini (which is assumed to
be in the installation root), or just data directory
under install root.
New utility to upgrade Windows service to higher MariaDB version.
Its functionality includes changing service definition as well as
running mysql_upgrade.