When you launch it, don't expect Netflix or YouTube to work. But here is the magic: (offloading rendering to Opera's servers) actually makes browsing on old Snapdragon 400/800 chips snappy .

Note for purists: Technically, Windows Phone 8 used .xap, and Windows 10 Mobile shifted to .appx. However, the community often uses "XAP" interchangeably when sideloading.

But can you install an .xap file on Windows 10 Mobile today? Yes—but you need to know the trick. If you search the Microsoft Store for "Opera," you will find nothing. Opera abandoned this ship around 2015. However, the legacy browser still exists in the form of an AppX Bundle (commonly referred to by the old XAP extension).