How do I run an exe from unity without a window poping up.

I currently am using this code.

     var  myProcess:Process = new Process();
     
      myProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
 
     myProcess.Start("phantomjs.exe",newD3Command);

To run the phantomjs.exe with the command stored in newD3Command, but I continue haveing a window pop up everytime I run this code despite the ProcessWindowStyle being set to Hidden. I am looking for some way of preforming the same task but without the window poping up. It is very annoying and it makes it so I have to click on the unity application in order to go back to the unity application. Any ideas how to fix this problem?