C:\Program Files\MySQL\MySQL Server 5.1\bin
this line does nothing if
bin
is not an executable. But
CD "C:\Program Files\MySQL\MySQL Server 5.1\bin"
would make sense.
MYSQL --user=root mysql
This one launch MYSQL if ypu are in right context.
CREATE USER 'User89'@'localhost' IDENTIFIED BY 'aaa';
This one is SQL commend and must be launch from inside the SQL server.
Solution 1 is probably what you want to do.