Петр

[DllImport("USER32.DLL", CharSet = CharSet.Auto)]
        internal static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

"Save Table".hWndByTitle().setTitle(csvDlg).waitForIdle().sendString(
                new string[] {
                    "DUIViewWndClassName",
                    "DirectUIHWND",
                    "FloatNotifySink",
                    "ComboBox",
                    "Edit" },
                csv);

internal static IntPtr sendString(this IntPtr hWnd, string[] classNames, string msg, bool verb = false)
        {
            var hCtrl = hWnd;
            if (classNames != null && classNames.Count() > 0)
            {
                Thread.Sleep(to[toFileStdDlg]);
                foreach (var c in classNames)
                {
                    Thread.Sleep(to[toFileStdDlg]);
                    hCtrl = user32.FindWindowEx(hCtrl, IntPtr.Zero, c, null);
                    if (hCtrl.Equals(IntPtr.Zero))
                    {
                        $"\tERROR :: sendString not found class {c}".log();
                        return hWnd;
                    }
                    else
                        hCtrl.waitForIdle();
                }
            }
            for (int i = 0; i < msg.Length; i++)
                user32.PostMessage(hCtrl, WM_CHAR, msg[i], 0);

            Thread.Sleep(to[toFileStdDlg]);
            user32.PostMessage(hWnd, WM_KEYDOWN, user32.VkKeyScan('\r'), 0);
            user32.PostMessage(hWnd, WM_KEYUP, user32.VkKeyScan('\r'), 0);
            return hWnd;
        }

[DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);