すべてのウィンドウタイトルを”みくあぺ”にしてやる…

[DllImport("user32.dll")]
private static extern bool SetWindowText(IntPtr hWnd, string lpString);

[STAThread]
private void Allmikuape_Click(object sender, RoutedEventArgs e)
{
foreach (var process in Process.GetProcesses())
{
IntPtr windowHandle = process.MainWindowHandle;

if (windowHandle != IntPtr.Zero)
SetWindowText(windowHandle, "みくあぺ");

}
}