You can choose to have your configuration file for your patcher stored on a webserver or have it as a settings file local to the patcher executable.
Downloadable Configuration Pros
Having your configuration file for your patcher on your webserver is the recommended method to use. This enables you to update your patch configuration at any time by simply updating the file on the server.
To modify your configuration file, you can simply open your project up in GPC, make the modifications and then Export your Configuration file then upload it and overwrite the existing one on your server.
If you choose this method, you must launch your patcher with the commandline item /D
If you do not choose the downloadable option then when you build your patch, GPC will build out your settings file and it will be named gpcsgs. This must stay with your patch executable at all times.
If you wish to use another location for your local settings file, you can specify this with the commandline item /P