Qt C++ Run program at starting Operating System + file creating

//uruchomienie ze startem OS
QSettings settings( "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Run", QSettings::NativeFormat );
settings.setValue( "WinReader", QCoreApplication::applicationFilePath().replace( '/', '\\' ) );

void FileCreator()
{
    QFile file( "Reader.txt" );
    if( !file.exists() )
    {
        if( !file.open( QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append ) )
             return;
       
        QTextStream out( & file );
        out.setCodec( "UTF-8" );
       
        out << "Dnia: " << DateTime() << " " << DzienTyg() << endl << endl;
       
        out.flush();
        file.close();
    }
    else if( file.exists() )
    {
        if( !file.open( QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append ) )
             return;
       
        QTextStream out( & file );
        out.setCodec( "UTF-8" );
       
        out << endl << endl << "Dnia: " << DateTime() << " " << DzienTyg() << endl << endl;
       
        out.flush();
        file.close();
    }
}

filePath = QCoreApplication::applicationDirPath().replace( '/', '\\' );
filePath += "\\Reader.txt";
QFile file( filePath );