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Код


        private void button1_Click(object sender, EventArgs e)
        {
            int count_files = 0;
            int count_all_char = 0;

            OpenFileDialog open_files = new OpenFileDialog();
            open_files.Multiselect = true;
            open_files.Filter = "Rich Text Format (*.rtf)|*.rtf";
            open_files.Title = "Type File";

            if (open_files.ShowDialog() == DialogResult.OK)
            {
                foreach (string s in open_files.FileNames) 
                {
                    int count_char;
                    MyThread thr = new MyThread(s);
                    thr._myThread.Join();
                    if (!thr._error)
                    {
                        count_char = thr._text_lenght;
                        textBox1.AppendText(s + " (" + count_char + ")\r\n");
                        count_all_char += count_char;
                        count_files++;
                    }
                }

                
                textBox1.AppendText("Всего файлов: " + count_files +"\r\n");
                textBox1.AppendText("Всего символов: " + count_all_char + "\r\n");
            }
        }

Код


using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Windows.Forms;
using System.IO;

namespace RtfCharecterCount
{
    class MyThread
    {
        public Thread _myThread;
        public string _file_path;
        public int _text_lenght;
        public bool _error = false;

        public MyThread(string filepath) 
        {
            _text_lenght = 0;
            _myThread = new Thread(new ThreadStart(this.run));
            _file_path = filepath;
            _myThread.Priority = ThreadPriority.Lowest;
            _myThread.Start();            
        }

        void run()
        {
            try {
                RichTextBox _rtb = new RichTextBox();
                _rtb.Visible = false;
                _rtb.LoadFile(_file_path);
                _text_lenght = _rtb.TextLength;
                _rtb.Clear();
            } catch(ArgumentException exp) {
                MessageBox.Show("Файл " + _file_path + " не является .rtf файлом!", "Ошибка!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                _error = true;
            } catch(IOException exp1) {
                MessageBox.Show("Не удаётся открыть файл " + _file_path + "\nЗакройте все программы использующие этот файл и попытайтесь снова.", "Ошибка!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                _error = true;
            }
        }
    }
}