How did i get this wierd password for mysql , Please help

[shreyas kn]

Hi,
i have installed Mysql and one service is running on 3306 (default).
now i changed the my.ini file and changed both client and server port to 8888
and created new instance using command.

C:\Program Files\MySQL\MySQL Server 5.1\bin>mysqld --install mysqld_sample --defaults-file=C:\sample_Data\data\my.ini

there is no password in my.ini file given as input.
then i start the service,
and i'm able to login using this password=mDet3#Sc.

Now i dont know how this password is comming, its already present in our application.
Can any one please help me ??

Thanks in advance
Shreyas