wcs2228
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In Extender mode, all devices will be on the same subnet. This probably explains why File and Printer sharing is working, since the Windows firewall will not block access from the same subnet, only different subnets.
Extender mode is known to have issues with DHCP sometimes, given the way it works. If this happens, you can try unplugging and replugging in the Ethernet cable. Alternatively, you can set static IP address, netmask, gateway IP address, DNS server addresses on the client PC, so it does not require DHCP.