Hi Scott,
I think the number of suggestions in this thread proves that there are a few options for achieving physical network bridging with a Windows box, and it depends on your situation which option is best for you:
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If you’re able to add static routes on your router, the easiest option is probably to set the IPEnableRouter registry entry on the Windows box that has ZeroTier installed and then on your router create a route to your ZT subnet through the IP of the Windows box. (as per @jakub.pisarczyk’s suggestion)
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If you don’t have control of your router (like me) or it won’t allow you to add static routes, but you can add static routes to the device you need to access from ZT (e.g. QNAP NAS in my case) then you can do the IPEnableRouter setting and then follow my instructions to create the route on the device itself.
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If neither of the above options are available to you, you’re probably best to follow @celien’s advice and set up a Linux box to be your ZT router, either by attaching a rpi or something to your network, or setting up a VM on your Windows server.
Happy to try and help with specifics if you’re able to share details about your particular network 