PowerToys/src/modules/FileLocksmith/FileLocksmithUI/FileLocksmithXAML/MainWindow.xaml

<winuiex:WindowEx
    x:Class="FileLocksmithUI.MainWindow"
    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:views="using:PowerToys.FileLocksmithUI.Views"
    xmlns:winuiex="using:WinUIEx"
    Width="680"
    MinWidth="480"
    MinHeight="320"
    IsShownInSwitchers="True"
    IsTitleBarVisible="True"
    mc:Ignorable="d">
    <Window.SystemBackdrop>
        <MicaBackdrop />
    </Window.SystemBackdrop>
    <Grid RowSpacing="16">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <TitleBar x:Name="titleBar">
            <!--  This is a workaround for https://github.com/microsoft/microsoft-ui-xaml/issues/10374, once fixed we should just be using IconSource  -->
            <TitleBar.LeftHeader>
                <ImageIcon
                    Height="16"
                    Margin="16,0,0,0"
                    Source="/Assets/FileLocksmith/Icon.ico" />
            </TitleBar.LeftHeader>
        </TitleBar>
        <views:MainPage x:Name="mainPage" Grid.Row="1" />
    </Grid>
</winuiex:WindowEx>