Windows Phone Xap Archive -

Since a XAP file is essentially a ZIP file, you do not need special software to look inside it on a computer.

If you want to modify a XAP game or translate an app, you can "decompile" windows phone xap archive

Halo: Spartan Assault , Sonic CD , Plants vs. Zombies , and Angry Birds (Windows Phone exclusive variants). Since a XAP file is essentially a ZIP

A .XAP (pronounced "zap") file is the proprietary application package format used by Windows Phone 7, 8, and 8.1. Essentially, a XAP file is a standard ZIP archive containing the application’s compiled code, assets (like images and audio), and a deployment manifest. you can "decompile" Halo: Spartan Assault