Hi,
The arduino.local is not usually supported in a standard Windows install...
For those who might find host files difficult in windows, one piece of advice given to address the Local issue:-
@Federico Fissore stated:-
'I think it may be solved by installing Bonjour for windows by Apple. I'm pretty sure that's the right step to follow. Please follow it and let me know.
If it keeps non working, you could use the ip address shown in the IDE'
If that helps anyone...
Liam