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I believe you may already known about new windowsphone 8.1 sdk that is now old windowsphone 8.0 "WMAppManifest.xml" file is renamed to "Package.appxmanifest" which is very similar to the Windows Store apps . Package.appxmanifest is xml file that included all info of our application such as targeted app OS version,App display name,App icons,capability permissions to run app,Start page to be App launch..etc .And every app package must have one package manifest file and off-course by default it is created by Visual Studio 2013 when you create new app. Ok lets see below image to understand how many new tabs are added in new package manifest file.
