Popup GUI application from Windows service

You can also use a batch file to execute your exe file, and write your execution of exe inside that and execute the batch file from your service. May I know the program scenario, what your code is doing

I can execute exe, that exe contain a win form. exe running as a background process, so GUI not appear.

You can execute an .exe from a Windows service very well. I have done it myself in the past. You need to make sure you had checked the option "Allow to interact with the Desktop" in the Windows service properties. If that is not done, it will not execute.

You can use System.Diagonostics.Process.Start("exe name");