.APPXUPLOAD File Extension
File TypeWindows 8 App Upload Package
What is an APPXUPLOAD file?
App package format introduced with Windows 8; used by developers when packaging Windows 8 apps and submitting them to the Windows Store; contains both the .APPX package as well as symbol debugging information that allows the app to report app crashes back to the developer for debugging and bug fixes.
You can create an app upload package in Visual Studio with the Create App Packages wizard. Choosein Visual Studio or in Visual Studio Express.