If your legacy device is running Windows 10 Mobile, you do not even need extra PC software.
Many XAPs require a live server to function. If the app was a cloud-based to-do list or a weather widget, it’s likely a brick. Focus on offline games and tools. windows phone xap archive
Even with a perfect XAP archive, you will encounter issues. If your legacy device is running Windows 10
As a nostalgic tech enthusiast, I recently stumbled upon the Windows Phone XAP Archive, a repository of XAP files for Windows Phone apps. For those who may not know, XAP (Xbox Application Package) files were used to distribute and install apps on Windows Phone devices before the Universal Windows Platform (UWP) era. windows phone xap archive