I can't Kill or Close the external exe that i already opened from the unity exe ?

Hello All
i am trying to create a simple unity scene that will be able to open another exe files on my pc , ok ?
i did that already
but when i try to make back again to the main unity app by close the current process that i have already opened , it doesn't ! ?
so why
that is my code
BTW when i try to print (p.id)
or print (p.name)
it is working , that is mean that i success to access the current process
so what is wrong here
as you see i use all parameters that could help me
Close
closemainwindow
Kill
so what is wrong ?
Thanks in Advance
i am using unity2017.2

 

/

 

I may be wrong but you may need to close main window first before you can close the process.

 

i wrote them all
cause they never work

 

I tested exactly same without the "kill" and window close first and it does work.

I think with UWP builds there were some problems but normal exe should work.