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On Windows, MySQL programs read startup options from the following files:

WINDIR represents the location of your Windows directory. This is commonly C:\Windows or C:\WinNT. You can determine its exact location from the value of the WINDIR environment variable using the following command:

C:\> echo %WINDIR%

On Unix, MySQL programs read startup options from the following files:

DATADIR represents the location of the MySQL data directory. Typically this is /usr/local/mysql/data for a binary installation or /usr/local/var for a source installation. Note that this is the data directory location that was specified at configuration time, not the one specified with --datadir when mysqld starts. Use of --datadir at runtime has no effect on where the server looks for option files, because it looks for them before processing any command-line arguments.