The MySQL Configuration Wizard places the
my.ini file in the installation directory
for the MySQL server. This helps associate configuration files
with particular server instances.
To ensure that the MySQL server knows where to look for the
my.ini file, an argument similar to this
is passed to the MySQL server as part of the service
installation:
--defaults-file="C:\Program Files\MySQL\MySQL Server 5.1\my.ini"
Here, C:\Program Files\MySQL\MySQL Server
5.1 is replaced with the
installation path to the MySQL Server. The
--defaults-file option instructs the MySQL
server to read the specified file for configuration options
when it starts.

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