外部调用unity的exe程序出现菜单

我们有个工程,需要外调unity的exe程序,外调的时候,有一定的概率出现菜单屏幕,需要客户按电源按钮(手柄上的),才能消失菜单屏幕。问题这个问题对于客户很不方便。
我们需要处理这个问题,怎么样外调可以不会出现菜单屏幕?
我们外调的方法是:
System.Diagnostics.Process.Start(str);//------str是外调unity的exe的路径。
Application.Quit();

We have a project, the need to adjust the unity of the exe program, when the transfer, there is a certain probability of the menu screen, you need to press the power button (handle), in order to disappear menu screen. The problem is very inconvenient for the customer. We need to deal with this problem, how can we not appear outside the menu screen? The way we tune out is:
System.Diagnostics.Process.Start(str);//------str是外调unity的exe的路径。 Application.Quit();
Someone could help me?please!