How to create a TIniFile object

Hi.... I'm trying to use a INI file in my program, but I don't know how to initialize it... I have the following procedure that plans to read a file called Monitor.ini:

procedure SetSerial;
var
  Archivo   : TIniFile;
  Puerto    : Byte;
  Baudios   : Integer;
begin
  with Archivo do
    begin
      Create('Monitor.ini');
      Puerto   := ReadInteger('Setup','Puerto',2);
      Baudios  := ReadInteger('Setup','Baud',19200);
      Archivo.Free;
      Emulador.Serial.DeviceName := 'Com' + Chr(Puerto+$30);
      case Baudios of
        2400  : Emulador.Serial.BaudRate := br2400;
        4800  : Emulador.Serial.BaudRate := br4800;
        9600  : Emulador.Serial.BaudRate := br9600;
        19200 : Emulador.Serial.BaudRate := br19200;
      end;
    end;
end;

When I compile it, compiler says the error that Archivo variable might not be initialized. What can I do before calling the Create method in order to initialize the object?

Thank in advance
Jaime