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if (openMxdDialog.ShowDialog() == DialogResult.OK)
            {
                pathMXD = openMxdDialog.FileName;
                
                if (pathMXD != null)
                {
                    if (axMapC.CheckMxFile(pathMXD))
                    {
                        threadProgress = new Thread
                            (new ParameterizedThreadStart(showProgress));
                        threadProgress.Start();
                        axMapC.LoadMxFile(pathMXD);
                    }
                }
            }