Subprocesses not opening File Select Dialog

[teut]

Hello ,
I am trying to run a command which should open up a File Select Windows widget in Kivy. Kivy has the non-native FileChooser class which is not user friendly in my perspective. My plan is to use a subprocess call to run a powershell script which would open a File Select Dialog.

class UserInfoWidget(BoxLayout):
    def browse_file(self):
        p = subprocess.Popen(["powershell.exe",
                              '"' + os.path.join(os.getcwd(), "filebrowser.ps1")+'"'],
                             stdout=sys.stdout)
        p.communicate()

Clicking the button once the kivy gui is launched gives the default statements in the shell and then when button is clicked gives
C:\Users\Dell\OneDrive\Desktop\New folder\filebrowser.ps1 in the shell.Why is the File Dialog not opening?
It is opening when I run powershell.exe ./filebrowser.ps1 in windows powershell or command prompt.
Img1- https://ibb.co/1G5SKMF
Img2 - https://ibb.co/bR44JqK