Convolving DSP, witch Windows recuired?

Yes, Roon 1.8 works under Win 7 and Windows Server 2016 seems to be equivalent to Windows 10 (but is not officially listed as supported so YMMV).

Why.

Isn’t that a desktop distribution (with GUI)? If so, why not try to use that instead of wasting money on Windows if you just need to send this file(s)? If it works, it works the same as (a true) Windows Roon remote.