LaunchOptions.DesiredRemainingView - Split screen launched app

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

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 the LauncherOptions.DesiredRemainingView to make sure every launch would have the apps split screen (50/50) and the native apps still open at whatever size they default to. Reader(50%), Photos(70%).

In the Windows Dev Center - Windows Store apps there is a sample for launching that includes the different enumerations of DesiredRemainingView and none of the enumerations worked when I built the downloaded sample.

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