Access to Windows shared folder over wifi network

In a Xamarin Forms project I need to load and save file from windows shared folder (with active directory authentication if possible).
Android device and pc are in the same wifi network.
I can manage files "inside" app using PCLStorage but I don't know how I can see external directory.
I can't create webservice on windows machine.
But file explorer like android Es File Explorer can do it, how?
Can I use something like samba?