string basepath = AppDomain.CurrentDomain.BaseDirectory;

            string filepath = "logs\\Log.log";

            string path = basepath + filepath;

         //   System.Diagnostics.Process.Start("explorer.exe", path);

            System.Diagnostics.ProcessStartInfo psi = new   System.Diagnostics.ProcessStartInfo("Explorer.exe");

            psi.Arguments = "/e,/select," + path;

            System.Diagnostics.Process.Start(psi);