Windows Phone applications used the .XAP file format, which is essentially a renamed .ZIP archive containing the application's compiled code, assets, and metadata. While the official Microsoft Store for these devices has long been shut down, community-led archives still preserve these files for enthusiasts. Where to Find XAP Archives
The Digital Preservation of the Windows Phone: The Role of XAP Archives XAP file format windows phone xap archive
To understand the archive, one must understand the artifact. Windows Phone applications used the
If you want, I can produce: (a) UI wireframes and flow, (b) CLI command spec, (c) sample validation rule set, or (d) implementation plan with milestones—tell me which. (b) CLI command spec