Add project files.

App.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<Application
+    x:Class="Windows_Mobile.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Windows_Mobile">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+                <!-- Other merged dictionaries here -->
+            </ResourceDictionary.MergedDictionaries>
+            <!-- Other app resources here -->
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using Microsoft.UI.Xaml.Shapes;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace Windows_Mobile
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : Application
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        {
+            m_window = new MainWindow();
+            m_window.Activate();
+        }
+
+        private Window m_window;
+    }
+}

MainWindow.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<Window
+    x:Class="Windows_Mobile.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Windows_Mobile"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:ui="using:CommunityToolkit.WinUI"
+    mc:Ignorable="d">
+
+    <Grid>
+        <Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
+            <Rectangle.Fill>
+                <ImageBrush Stretch="UniformToFill" x:Name="wallpaperImage" />
+            </Rectangle.Fill>
+        </Rectangle>
+        <StackPanel x:Name="startMenu" Margin="0,0,0,80" VerticalAlignment="Bottom" Translation="0,900,40" CornerRadius="8" Background="{ThemeResource AcrylicInAppFillColorBaseBrush}" BorderThickness="1" BorderBrush="{ThemeResource SystemControlBackgroundBaseLowRevealBorderBrush}" Height="800" Width="700">
+            <StackPanel.Shadow>
+                <ThemeShadow />
+            </StackPanel.Shadow>
+            <StackPanel Height="735" VerticalAlignment="Top" Background="{ThemeResource LayerOnMicaBaseAltFillColorSecondaryBrush}" BorderThickness="0,0,0,1" BorderBrush="{ThemeResource AccentControlElevationBorderBrush}">
+                <AutoSuggestBox Height="40" FontSize="15" VerticalContentAlignment="Center" PlaceholderText="Search apps" QueryIcon="Find" TextChanged="AutoSuggestBox_TextChanged" />
+                <ListView x:Name="apps" Height="695" SelectionChanged="apps_SelectionChanged" />
+            </StackPanel>
+            <StackPanel.TranslationTransition>
+                <Vector3Transition />
+            </StackPanel.TranslationTransition>
+        </StackPanel>
+        <Rectangle x:Name="taskViewBackground" Visibility="Collapsed" Opacity="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
+            <Rectangle.OpacityTransition>
+                <ScalarTransition />
+            </Rectangle.OpacityTransition>
+            <Rectangle.Fill>
+                <AcrylicBrush TintColor="#F3F3F3" TintOpacity="0.0" FallbackColor="Transparent" />
+            </Rectangle.Fill>
+        </Rectangle>
+        <Grid Background="{ThemeResource AcrylicInAppFillColorBaseBrush}" BorderThickness="0,1,0,0" BorderBrush="{ThemeResource SystemControlBackgroundBaseLowRevealBorderBrush}" Height="70" HorizontalAlignment="Stretch" VerticalAlignment="Bottom">
+            <StackPanel Orientation="Horizontal" Spacing="4" HorizontalAlignment="Center" VerticalAlignment="Center">
+                <ToggleButton Click="StartMenu_Click" Background="Transparent" BorderThickness="0" ToolTipService.ToolTip="Start" Height="60" Width="60" Content="{ui:BitmapIcon Source=Assets/StartMenuIcon.png}">
+                    <ToggleButton.Resources>
+                        <SolidColorBrush x:Key="ToggleButtonBackgroundChecked" Color="{ThemeResource ControlFillColorDefault}" />
+                        <SolidColorBrush x:Key="ToggleButtonBackgroundCheckedPointerOver" Color="{ThemeResource ControlFillColorSecondary}" />
+                        <SolidColorBrush x:Key="ToggleButtonBackgroundCheckedPressed" Color="{ThemeResource ControlFillColorTertiary}" />
+                    </ToggleButton.Resources>
+                </ToggleButton>
+                <ToggleButton Click="TaskView_Click" Background="Transparent" BorderThickness="0" ToolTipService.ToolTip="Start" Height="60" Width="60" Content="{ui:FontIcon FontSize=38, Glyph=&#xE7C4;}">
+                    <ToggleButton.Resources>
+                        <SolidColorBrush x:Key="ToggleButtonBackgroundChecked" Color="{ThemeResource ControlFillColorDefault}" />
+                        <SolidColorBrush x:Key="ToggleButtonBackgroundCheckedPointerOver" Color="{ThemeResource ControlFillColorSecondary}" />
+                        <SolidColorBrush x:Key="ToggleButtonBackgroundCheckedPressed" Color="{ThemeResource ControlFillColorTertiary}" />
+                        <SolidColorBrush x:Key="ToggleButtonForegroundChecked" Color="{ThemeResource TextFillColorPrimary}" />
+                        <SolidColorBrush x:Key="ToggleButtonForegroundCheckedPointerOver" Color="{ThemeResource TextFillColorPrimary}" />
+                        <SolidColorBrush x:Key="ToggleButtonForegroundCheckedPressed" Color="{ThemeResource TextFillColorSecondary}" />
+                        <SolidColorBrush x:Key="ToggleButtonForegroundCheckedDisabled" Color="{ThemeResource TextFillColorDisabled}" />
+                    </ToggleButton.Resources>
+                </ToggleButton>
+            </StackPanel>
+        </Grid>
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Media.Imaging;
+using Microsoft.UI.Xaml.Navigation;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.System;
+using System.Numerics;
+using Windows.Storage.Pickers.Provider;
+using System.IO.Enumeration;
+using Windows.Storage;
+using Windows.Devices.AllJoyn;
+using Windows.ApplicationModel.Contacts;
+using System.Collections.ObjectModel;
+using System.Text.RegularExpressions;
+using Windows.Networking;
+using System.Threading.Tasks;
+using Windows.ApplicationModel.Core;
+using System.IO.Packaging;
+using Windows.Management.Deployment;
+using System.Net.Http.Headers;
+using System.Security.Principal;
+using System.Xml.Linq;
+using Microsoft.Windows.ApplicationModel.DynamicDependency;
+using Microsoft.WindowsAPICodePack.Shell;
+using System.Runtime.InteropServices;
+using System.Windows.Interop;
+using System.Drawing.Imaging;
+using System.Drawing;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace Windows_Mobile
+{
+    /// <summary>
+    /// An empty window that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            this.InitializeComponent();
+
+            Title = "Windows Mobile";
+            this.AppWindow.SetPresenter(Microsoft.UI.Windowing.AppWindowPresenterKind.FullScreen);
+
+            wallpaperImage.ImageSource = new BitmapImage() { UriSource = new Uri("C:\\Users\\" + Environment.UserName + "\\AppData\\Roaming\\Microsoft\\Windows\\Themes\\TranscodedWallpaper") };
+
+            IndexStartMenuItems();
+        }
+
+        private void IndexStartMenuItems()
+        {
+            string userItemsDirectory = "C:\\Users\\" + Environment.UserName + "\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs";
+
+            IEnumerable<string> userStartMenuItems = Directory.EnumerateFiles(userItemsDirectory);
+            string[] userStartMenuFolders = Directory.GetDirectories(userItemsDirectory);
+
+            foreach (string folder in userStartMenuFolders)
+            {
+                //Replace GetFiles with something that gets all files (including in subdirectories)
+                string[] folderItems = Directory.GetFiles(folder);
+
+                if (folderItems.Length == 1)
+                {
+                    foreach (string item in folderItems)
+                    {
+                        userStartMenuItems = userStartMenuItems.Append(item);
+                    }
+                }
+            }
+
+            foreach (string item in userStartMenuItems)
+            {
+                if (!item.EndsWith(".ini"))
+                {
+                    FileInfo file = new FileInfo(item);
+
+                    string name = file.Name.Replace(file.Extension, string.Empty);
+
+                    allApps.Add(new TextBlock() { Text = name, Name = item, Tag = "Normal" });
+                }
+            }
+
+
+            string systemItemsDirectory = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs";
+
+            IEnumerable<string> systemStartMenuItems = Directory.EnumerateFiles(systemItemsDirectory);
+            string[] systemStartMenuFolders = Directory.GetDirectories(systemItemsDirectory);
+
+            foreach (string folder in systemStartMenuFolders)
+            {
+                //Replace GetFiles with something that gets all files (including in subdirectories)
+                string[] folderItems = Directory.GetFiles(folder);
+
+                if (folderItems.Length == 1)
+                {
+                    foreach (string item in folderItems)
+                    {
+                        systemStartMenuItems = systemStartMenuItems.Append(item);
+                    }
+                }
+            }
+
+            foreach (string item in systemStartMenuItems)
+            {
+                if (!item.EndsWith(".ini"))
+                {
+                    FileInfo file = new FileInfo(item);
+
+                    string name = file.Name.Replace(file.Extension, string.Empty);
+
+                    allApps.Add(new TextBlock() { Text = name, Name = item, Tag = "Normal" });
+                }
+            }
+
+
+            PackageManager packageManager = new PackageManager();
+            IEnumerable<Windows.ApplicationModel.Package> packages = packageManager.FindPackagesForUser(string.Empty);
+
+            foreach (Windows.ApplicationModel.Package package in packages)
+            {
+                if (!package.IsResourcePackage && !package.IsFramework && !package.IsStub && !package.IsBundle)
+                {
+                    IReadOnlyList<AppListEntry> appListEntries = package.GetAppListEntries();
+
+                    foreach (AppListEntry appListEntry in appListEntries)
+                    {
+                        allApps.Add(new TextBlock() { Text = appListEntry.DisplayInfo.DisplayName, Name = package.Id.Name, Tag = "Packaged" });
+                    }
+                }
+            }
+
+
+            var ordered = from item in allApps
+                           orderby item.Text.Substring(0, 1)
+                           select item;
+
+            foreach (TextBlock item in ordered)
+            {
+                apps.Items.Add(item);
+            }
+        }
+
+        private void StartMenu_Click(object sender, RoutedEventArgs e)
+        {
+            startMenu.Translation = startMenu.Translation == new Vector3(0, 900, 40) ? new Vector3(0, 0, 40) : new Vector3(0, 900, 40);
+        }
+
+        private void TaskView_Click(object sender, RoutedEventArgs e)
+        {
+            if (taskViewBackground.Opacity == 1)
+            {
+                taskViewBackground.Visibility = Visibility.Collapsed;
+                taskViewBackground.Opacity = 0;
+            }
+            else
+            {
+                taskViewBackground.Visibility = Visibility.Visible;
+                taskViewBackground.Opacity = 1;
+            }
+        }
+
+        private void apps_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            if (apps.SelectedItem is not null)
+            {
+                TextBlock selectedItem = apps.SelectedItem as TextBlock;
+
+                if (selectedItem.Tag as string == "Normal")
+                {
+                    Process.Start(new ProcessStartInfo(selectedItem.Name) { UseShellExecute = true });
+                }
+                else
+                {
+                    PackageManager packageManager = new PackageManager();
+                    IEnumerable<Windows.ApplicationModel.Package> packages = packageManager.FindPackagesForUser(string.Empty);
+
+                    foreach (Windows.ApplicationModel.Package package in packages)
+                    {
+                        if (package.Id.Name == selectedItem.Name)
+                        {
+                            IReadOnlyList<AppListEntry> appListEntries = package.GetAppListEntries();
+
+                            foreach (AppListEntry appListEntry in appListEntries)
+                            {
+                                appListEntry.LaunchAsync();
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        Collection<TextBlock> allApps = new();
+
+        private void AutoSuggestBox_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args)
+        {
+            var filteredUnordered = allApps.Where(textBlock => Filter(textBlock, sender.Text));
+
+            var filtered = from item in filteredUnordered
+                        orderby item.Text.Substring(0, 1)
+                        select item;
+
+            for (int i = apps.Items.Count - 1; i >= 0; i--)
+            {
+                var item = apps.Items[i];
+
+                if (!filtered.Contains(item))
+                {
+                    apps.Items.Remove(item);
+                }
+            }
+
+            foreach (TextBlock item in filtered)
+            {
+                if (!apps.Items.Contains(item))
+                {
+                    apps.Items.Add(item);
+                }
+            }
+        }
+
+        private bool Filter(TextBlock textBlock, string filter)
+        {
+            return textBlock.Text.Contains(filter, StringComparison.InvariantCultureIgnoreCase);
+        }
+    }
+}