We define a custom protocol handler to handle authentication requests – it handles
blockstack:// style URLs.
The protocol handler on Windows can sometimes get a funny name – I’m not sure why exactly, but I’m pretty sure it has something to do with The Windows Registry. Anyways, yes, you should open the authentication request protocol handler.
The protocol handler itself opens a URL like
https://localhost:8888/auth?authRequest=<foo> in your default browser. If your default browser is Edge, you get the window in Edge. However, if you’ve set up your Blockstack profile in Firefox, you might want it to open there instead. You can copy and paste that URL into Firefox in that case, or go and change your default browser to Firefox (it’s in Windows account settings).