Finally found an answer for my question. we could import the dumb file in the following way:
1.From the command prompt go to the root of the server
C:\Program Files\MySQL\MySQL Server 5.1\bin>
2.Load the dumb file into the server using following command
bin>mysql -uroot -p<server_password> {database_name} < {complete filepath}
Example:bin>MySQL -uroot -ppassword mydb < C:\Users\Anto\Documents\DB_Dumb