Can I change Silverlight out-of-browser settings at runtime?

According to MSDN you can do that.

To configure an existing application for out-of-browser support without recompiling, add the configuration XML to the manifest in an existing .xap file. To do this, copy the Deployment.OutOfBrowserSettings property element from the following example code into the manifest file, and then update the values.

As an alternative to the designer, you can specify the out-of-browser settings by populating the manifest template (AppManifest.xml in the Properties or My Project folder) as shown in the following example. By default, the build uses the manifest template to generate the application manifest. However, the template XML is simpler to use in Visual Studio.

Source: http://msdn.microsoft.com/en-us/library/dd833073(v=vs.95).aspx

Remember, that the *.xap file is a simple zip. So you can extract it, modify, and then zip it again. Seems pretty simple to automate.

You can also change the title of the application at runtime (i don't know how to change the icon or description, but i think that woulndt have sense anyway) by implementing your own chrome window. For sample implementation follow this

To localize title you would have to change the value of title, to binding, and bind it to your resource(all code is some customization of sample project from link above):

MainPage.xaml:

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:Silverlight4.OOB.ChromelessWindow.Demo" x:Class="Silverlight4.OOB.ChromelessWindow.Demo.MainPage"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" MinWidth="400" MinHeight="300">
<Grid x:Name="LayoutRoot" Background="White">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition/>
    </Grid.RowDefinitions>        
    <Border BorderBrush="Black" BorderThickness="1" Margin="0,-25,0,0" Grid.Row="1"/>
    <local:ControlBar x:Name="ucControlBar" VerticalAlignment="Top" Title="{Binding Source={StaticResource resxWrapper}, Path=Title}"></local:ControlBar>
    <Border BorderBrush="Black" BorderThickness="1" CornerRadius="10" Grid.Row="1" Margin="10">
        <Border.Background>
            <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
                <GradientStop Color="#FFFDC97A"/>
                <GradientStop Color="White" Offset="0.5"/>
                <GradientStop Color="#FFFDC97A" Offset="1"/>
            </LinearGradientBrush>
        </Border.Background>

    </Border>
    <ComboBox SelectionChanged="ComboBox_SelectionChanged" Grid.Row="1" Height="20">
        <ComboBoxItem Content="pl-PL" />
        <ComboBoxItem Content="en-GB" />
    </ComboBox>
    <TextBlock x:Name="txtTitle" HorizontalAlignment="Center" Grid.Row="1" TextWrapping="Wrap" VerticalAlignment="Top" FontSize="32" Text="Silverlight 4 Custom Out-Of-Browser Window Demo" Margin="10" TextAlignment="Center" Foreground="#FF5A098F"/>
    <TextBlock x:Name="txtInfo" HorizontalAlignment="Center" Grid.Row="1" TextWrapping="Wrap" Text="You are running inside Browser Window" VerticalAlignment="Bottom" Margin="10" FontSize="24" TextAlignment="Center"/>        
</Grid>

Added file ResourceMock.cs:

 public class ResourceMock:INotifyPropertyChanged
{
    public string Title
    {
        get
        {
            MessageBox.Show(Thread.CurrentThread.CurrentCulture.Name);
            switch (Thread.CurrentThread.CurrentCulture.Name)
            {
                case "en-GB": return "English"; break;
                case "pl-PL": return "Polish"; break;
                default: return "default";
                    break;
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
    public void firePropertyChanged(string property)
    {
        OnPropertyChanged(property);
    }
}

MainPage.xaml.cs:

public partial class MainPage : UserControl
{
    public MainPage()
    {
        InitializeComponent();

        if (App.IsRunningOOBWithPermission)
        {
            txtInfo.Text = "You are running outside Browser Window.";
        }
        else
        {
            txtInfo.Text = "You are running inside Browser Window.";
        }
    }

    private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var cultrue = (e.AddedItems[0] as ComboBoxItem).Content.ToString();
        try
        {
            Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo(cultrue);
            var res = App.Current.Resources["resxWrapper"] as ResourceMock;
            res.firePropertyChanged("Title");
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }


}

App.xaml:

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
         x:Class="Silverlight4.OOB.ChromelessWindow.Demo.App"
         xmlns:loc="clr-namespace:Silverlight4.OOB.ChromelessWindow.Demo"
         >
    <Application.Resources>
       <loc:ResourceMock x:Key="resxWrapper"></loc:ResourceMock>
    </Application.Resources>
</Application>

This is very simple sample, to show, that you can change the title at Runtime. Im assmuming, that if you have title exposed as bindable property, then you will know how to implement your own localization.

For the above sample to work, you need to add "en-GB;pl-PL" to the SupportedCultrues tag, in the project file (*.csproj).

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