It sounds like you’re looking for the official app download, but you also hinted at an “interesting story.” Let me address both.

If you were looking for a different story (e.g., about Facebook’s history on Windows Phone, which failed spectacularly), let me know – that’s another fascinating tale!

But in 2021–2022, Facebook brought back a via the Microsoft Store, built on WebView2 (Edge’s engine). So if you download it today, you’re getting a hybrid: part web, part app. The “story” here is that Microsoft had to work directly with Facebook to improve the Windows experience because Facebook kept prioritizing mobile and web over desktop.