Here's an update: contrary to what I said Infuse for both iOS and Apple TV 4 can add my Windows 10-64 bit using the Fall Creators Update, if I enter manually the credentials and save them. Previously I was only able to do this using iOS, but now the ATV seems to be working and the "SAVE" button can be used. Perhaps some data was not entered when I tried.
The credentials are:
Name of the computer
Workgroup (leave blank)
IP (for my PC it's 192.168.8.144. Router's gateway is 192.168.8.1, and the .44 IP is permanent, assigned by the gigabit router)
Login (from Windows)
Password (from Windows)
Pictures taken minutes ago:
https://imgur.com/a/rxr8W
When I finally managed to solve this after having give up a long time ago.
Right now Infuse Pro 4.3.7 for iOS and ATV 4 can read the contents from my Hard Drive, I don't have a 5.X subscription, but it's safe to assume it works there, too.
Despite this workaround the bug still remains for both iOS and ATV 4, since the 192.168.8.144 IP is not detected automatically, and other apps (for iOS, and VLC for ATV) can detect it right away. I believe there's something interfering with this recognition, other apps while scanning my network can see the PC in it.
As for the wake on LAN bug in the iOS version (mentioned in the iOS thread) I have no idea what caused it.
What I am going to do is format the PC and reinstall Windows 10 (hopefully without that Fall Creators Update). After that I think this detection problem will be solved for good.