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Can I set my Play1 to alao be my windows PC speaker?
No. Sonos are not designed to be easily used as a PC speaker.
I would say yes…

Take a look at https://www.sonos.com/en/controller-app

Download the desktop app for windows.
The controller provides the ability to control your Sonos speaker. It does not provide the ability to play whatever audio is originating from your PC, as a PC speaker would.