57 This URI along the applicationName would allow a target to indicate where the data originally came from, especially for scenarios where the data goes to a social network, in an email message, or elsewhere off the device with the source app. This way, recipients can be invited to acquire the source app themselves, so source apps will probably want to include it. You always want to use the Windows.ApplicationModel.Store.CurrentApp.linkUri property to populate this field because you won’t know your URI until your completed app is uploaded to the Store the first time.

58 In any case, it’s a good idea to register your URI scheme with the Internet Assigned Numbers Authority (IANA). RFC 4395 is the particular specification for defining new URI schemes.

59 Ignore, however, the sample’s use of targetsize-* naming conventions for the app’s tile images; target sizes apply only to file and URI scheme associations.