ExtensionName value in the WMAppManifest.xml file is defined in an Extras.xml file. The Extras.xml file allows you to add custom captions for your app in the quick card, depending on the category of the search result; see Listing 31.2.
The Extras.xml file is composed of the following elements:
ExtrasInfo—The root element.
AppTitle—(Used only in Windows Phone OS 7.1). Contains the default and localized strings representing the title of the application as it will appear in the apps pivot page. Only ...