Standard Launch
Windows.System.Launcher.LaunchUriAsync(new System.Uri(“sm-plite:”); 

Launch with photo / video
Windows.System.Launcher.LaunchUriAsync(new System.Uri(“lockimage:”); 

Windows.System.Launcher.LaunchUriAsync(new System.Uri(“lockvideo:”); 

All URI will open Private Image/Video Lock App.  In Process to add image from gallery & also passing directly the image/video.