Wich machine.config gets loaded by the Editor?

I am using the windows version of Unity 2.5

On the installation folder there are five machine.config files:

• C:\Program Files\Unity\Editor\Data\etc\mono\2.0\machine.config
  C:\Program Files\Unity\Editor\Data\Frameworks\Mono.framework\mono\2.0\machine.config
  C:\Program Files\Unity\Editor\Data\Frameworks\UnityPlayer.app\Contents\Frameworks\Mono.framework\mono\2.0\machine.config
  C:\Program Files\Unity\Editor\Data\Frameworks\WindowsPlayerMonoConfig\2.0\machine.config
  C:\Program Files\Unity\WebPlayer\mono\2.x.x\Data\etc\mono\2.0\machine.config

Which one, if any, gets loaded by the editor?

Also there are four other files named "config" that seen to be configuration files. Does one of then gets loaded?

• C:\Program Files\Unity\Editor\Data\Frameworks\WindowsPlayerMonoConfig\config
  C:\Program Files\Unity\Editor\Data\Frameworks\Mono.framework\mono\config
  C:\Program Files\Unity\Editor\Data\Frameworks\UnityPlayer.app\Contents\Frameworks\Mono.framework\mono\config

I am asking this because it seens that that some configurations are not being applied to the System.Net.WebRequest class (but just when running inside the editor).