Windows location for DNS root key?

[Rick van Rein via Unbound-users]

Hi,

We are porting a Linux application to Windows, and this uses Unbound for
DNSSEC security.  On Linux, we have a well-defined location for the root
key, namely /etc/unbound/root.key, but on Windows we are less lucky.
What should we use, what do others do; is there a common place, possibly
relative to the library, and will it upgrade automatically?

Thanks,
 -Rick