LaunchOptions.DesiredRemainingView - application for launching Split

Question

I am trying to open files in my native application from my application.

Windows.Storage.ApplicationData.current.localFolder.getFileAsync("downloads\\" + fileName).then(
    function (file) {
        var options = new Windows.System.LauncherOptions();
        options.displayApplicationPicker = true;
        options.desiredRemainingView = Windows.UI.ViewManagement.ViewSizePreference.useHalf;

        Windows.System.Launcher.launchFileAsync(file, options).then(
            function (success) {
                if (success) {
                    //File launched
                } else {
                    // File launch failed
                }
            });
    });

I tried using LauncherOptions.DesiredRemainingView so that each launch has a split application screen (50/50) and your own applications open whatever size they are by default. Reader (50%), Photos (70%).

The Windows Dev Center application for the Windows Store has a launch sample that includes various DesiredRemainingView enumerations , and none of the operations listed were processed when I built the downloaded sample.

Are there other options (LauncherOptions) that I need to change / set?