"Continue with Google" opens nothing on Windows — and it's not the browser, the app, or your account
TL;DR: A desktop app's "Sign in with Google" button silently did nothing — the browser never opened. After a long hunt it turned out Windows Subsystem for Android (WSA) had registered Google's sign-in domains (accounts.google.com, etc.) as "App URI Handlers" ("Apps for websites"), so Windows routed every shell-opened google.com link to a crashing Android app instead of the browser. It affected every browser and every app that opens Google login via the OS. Fix: remove the hijacking association (uninstall/repair WSA, or disable App URI Handlers) and reboot.
This write-up documents the symptom, the full diagnostic journey (including the wrong turns, because they're instructive), the root cause, the fix, and a reusable playbook so you can diagnose "a URL opens the wrong app / nothing" in minutes next time.

