public void LoadFiles(bool _use_a_watcher = true)
        {
            if (!File.Exists(this.SummaryFileName))
            {
                return;
            }

            try
            {
                // read and parse file
                this.FStream = new StreamReader(this.SummaryFileName);
                bool reached_eof = false;
                while (this.HasNext())
                {
                    this.Next();
                    if (this.FValue == ParamStructTypes.EOF)
                    {
                        reached_eof = true;
                        if (this.current_file_record != null)
                        {
                            this.loaded_file_records.Add(this.current_file_record);
                        }
                        this.ReleaseRessources();
                        break;
                    }
                    this.ParseSummaryFile();
                }
                if (!reached_eof)
                {
                    this.ReleaseRessources();
                }

                // load components from the files according to user role and ...
                StringBuilder sb_new      = new StringBuilder();
                DXFDecoder    dxf_decoder = new DXFDecoder(this.MV_Factory, this.P_Factory, this.COMP_Factory);

                foreach (PartialFileRecord fr in this.loaded_file_records)
                {
                    if (File.Exists(fr.FileName))
                    {
                        // adjust the locks on the file (06.02.2017)
                        bool lock_edit = true;
                        this.nr_locks_record[(int)fr.Manager] = fr.NrLocks;
                        if (DXFDistributedDecoder.HasEditingRights(this.manager, fr.Manager))
                        {
                            lock_edit = (fr.NrLocks > 0);
                            this.nr_locks_record[(int)fr.Manager] = fr.NrLocks + 1;
                            fr.NrLocks++;
                        }

                        dxf_decoder.LoadFromFile(fr.FileName, lock_edit);
                    }
                    fr.AddToExport(ref sb_new);
                }
                dxf_decoder.DoDeferredOperations(); // connects components and networks saved in different partial files
                this.COMP_Factory.RestoreReferencesWithinRecord();
                this.COMP_Factory.MakeParameterOutsideBoundsVisible();

                // ... modify the summary file accordingly
                this.WriteSummaryFile(this.SummaryFileName, ref sb_new);
                this.FileRecordsOpen = true;

                // ... set a watcher on the file
                if (_use_a_watcher)
                {
                    this.SetWatcher();
                }
            }
            catch (Exception ex)
            {
                this.ReleaseRessources();
                MessageBox.Show(ex.Message, "Error reading simultan file: " + this.SummaryFileName,
                                MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }