Sorry if I have the wrong terminology....

I have a router set up with subnets as in 192.168.1.xxx 192.168.2.xxx and all was well when I was using Win 7. I could have a file server PC with a static I/P of 192.168.2.25 and on it set some folders to share - everyone - read only. I could Map Network Drive to it from a PC on the 192.168.1.xxx or 192.168.2.xxx networks.

I gradually switched the PC's to Win 10 and file sharing continued to work - but when I switched the file server PC to Win 10 - the file sharing broke. I got it partially back by setting up an account on the file share PC that I can use from other computers on the 192.168.2.xx network to 'login' to it - thus giving those pc's access to the files. But I cannot ping or otherwise access the 192.168.2.25 computer from the 192.168.1.xxx network.