Gives an answer to the question: How / Why was your App launched?
Launch | launch The user launched the app or tapped a content tile.
Search | search The user wants to search with the app.
ShareTarget | shareTarget 
The app is activated as a target for share operations.
File | file 
An app launched a file whose file type this app is registered to handle.
Protocol | protocol 
An app launched a URL whose protocol this app is registered to handle.
FileOpenPicker | fileOpenPicker 
The user wants to pick files or folders that are provided by the app.
FileSavePicker | fileSavePicker 
The user wants to save a file and selected the app as the location.
CachedFileUpdater | cachedFileUpdater 
The user wants to save a file that the app provides content management for.
ContactPicker | contactPicker 
The user wants to pick contacts.
Device | device 
The app handles AutoPlay.
PrintTaskSettings | printTaskSettings 
The app handles print tasks.
CameraSettings | cameraSettings 
The app captures photos or video from an attached camera.