Strava does not offer an App for Windows Phones or Windows 10, and unfortunately, we do have plans to support this operating system in the future. However, there are a handful of options or workarounds recommended by our community so that you can still post your GPS data to Strava:
CycloMeter App: From the CycloMeter App, there is a plugin that can be purchased for a small amount to allow data to be automatically published to Strava.
Cycle Tracks GPS: Similarly, publishing data to Strava from this app is a one-time add-on purchase.
Cyclers app for Windows phones.