NTEventLogAppender Log Category

Hello,
Is there a reason for the category of the event to be like they are.
That is :
Case Level::FATAL_INT:
                ret_val = 1;
                break;
case Level::ERROR_INT:
                ret_val = 2;
                break;
case Level::WARN_INT:
                ret_val = 3;
                break;
case Level::INFO_INT:
                ret_val = 4;
                break;
case Level::DEBUG_INT:
default:
                ret_val = 5;
                break;

Because in the EventLog Viewer : 1 = Shell, 2 = Services, 3 = Printers, 4 =
Drive, 5 = Devices; and I do not find it realy significant. None would be
more appropriate.

Thank you
Bruno Labelle