Succeeding in using these archives usually requires "sideloading" apps onto a device. While specific steps can vary, the general process involves:
Standard Windows Phones reject unsigned or third-party XAP files. You must "Interop Unlock" your device, which is the Windows Phone equivalent of jailbreaking or rooting. Tools like or WUT (Windows Universal Tool) are commonly used by the community to modify the registry and grant full sideloading permissions. Step 2: Setting up the SDK Tools windows phone xap archive full