Siri Windows API: Make Windows PC print a document via voice command to Siri HomePod
Workflow on iOS allows you to perform web service calls and send commands over SSH. The Siri shortcuts functionality coming in iOS 12 appears to be based at least partially on Workflow’s technology (Apple aqui-hired the developers.)

As to whether all of Workflow’s functionality will appear in Siri Shortcuts at some point, I have no information either way.

Even if it does, it would be up to you to provide some sort of endpoint/plumbing on the Windows side to actually pull this off. You’d be fully on your own.