POSIX subsystem scaffold, NT syscall wrappers, shell UI fixes, and console-logon utility

README.md

@@ -37,5 +37,22 @@ nix run .#build-installer
 - `adk/ossetup/` - Windows installer (ImGui + DirectX 11)
 - `libredaemon/` - Rust daemon for LibreNT
 - `drivers/` - BTRFS and other Windows drivers 
+
+### Utility Scripts
+
+- `utils/Enable-ConsoleLogon.ps1` - toggles classic/console-style logon fallback by disabling or restoring `authui.dll` (supports online and offline Windows roots).
+
+Example:
+
+```powershell
+# Apply on current system (Admin shell)
+.\utils\Enable-ConsoleLogon.ps1
+
+# Apply to offline image mounted at D:\
+.\utils\Enable-ConsoleLogon.ps1 -WindowsRoot 'D:\Windows'
+
+# Restore
+.\utils\Enable-ConsoleLogon.ps1 -WindowsRoot 'D:\Windows' -Restore
+```
 > [!NOTE]
 > I will accept **any** contributions to this project, even if it's just a typo fix, a driver update, or a new feature.

mswindows/shell/App.xaml.cs

@@ -10,7 +10,6 @@ namespace LibreNT.Shell;
 
 public partial class App : Application
 {
-    private Window? _window;
     private static readonly string LogoPath = "../../librentlogo.svg";
 
     public static Window? MainWindow { get; private set; }
@@ -27,7 +26,7 @@ protected override void OnLaunched(LaunchActivatedEventArgs args)
         MainWindow.Activate();
     }
 
-    private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
+    private void OnUnhandledException(object sender, Microsoft.UI.Xaml.UnhandledExceptionEventArgs e)
     {
         // Log error and continue
     }

mswindows/shell/Components/StartMenu/StartMenu.xaml

@@ -14,8 +14,7 @@
 
     <Border Background="{ThemeResource SystemControlBackgroundBaseHighBrush}"
             CornerRadius="{StaticResource StartMenuCornerRadius}"
-            Padding="12"
-            DropShadow>
+            Padding="12">
         <Grid>
             <Grid.RowDefinitions>
                 <RowDefinition Height="Auto" />

mswindows/shell/Components/StartMenu/StartMenu.xaml.cs

@@ -2,6 +2,7 @@
 using Microsoft.UI.Xaml.Controls;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Diagnostics;
 
 namespace LibreNT.Shell.Components.StartMenu;
 
@@ -65,29 +66,41 @@ private void OnAppClick(object sender, RoutedEventArgs e)
 
     private void LaunchApp(string appId)
     {
-        // Launch the application - in a real implementation,
-        // this would use Windows.ApplicationModel.Store or Process.Start
         switch (appId)
         {
             case "explorer":
-                Windows.System.ProcessLauncher.TryLaunch("explorer.exe", "");
+                TryLaunch("explorer.exe");
                 break;
             case "terminal":
-                Windows.System.ProcessLauncher.TryLaunch("wt.exe", "");
+                TryLaunch("wt.exe");
                 break;
             case "browser":
-                Windows.System.ProcessLauncher.TryLaunch("msedge.exe", "");
+                TryLaunch("msedge.exe");
                 break;
             case "settings":
-                Windows.System.ProcessLauncher.TryLaunch("ms-settings:", "");
+                TryLaunch("ms-settings:");
                 break;
             default:
-                // For demo purposes, show a message
-                // In production, use proper file associations
                 break;
         }
     }
 
+    private static void TryLaunch(string target)
+    {
+        try
+        {
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = target,
+                UseShellExecute = true
+            });
+        }
+        catch
+        {
+            // TODO: wire into shell notifications/logging.
+        }
+    }
+
     private void OnShutdownClick(object sender, RoutedEventArgs e)
     {
         // Shutdown logic

mswindows/shell/Components/SystemTray/SystemTray.xaml.cs

@@ -10,7 +10,7 @@ namespace LibreNT.Shell.Components.SystemTray;
 
 public sealed partial class SystemTray : UserControl, INotifyPropertyChanged
 {
-    private Timer? _timer;
+    private System.Timers.Timer? _timer;
     private string _currentTime = string.Empty;
 
     public string CurrentTime
@@ -30,7 +30,7 @@ public SystemTray()
 
     private void InitializeTimer()
     {
-        _timer = new Timer(1000);
+        _timer = new System.Timers.Timer(1000);
         _timer.Elapsed += (s, e) => UpdateTime();
         _timer.Start();
     }

mswindows/shell/LibreNT.Shell.csproj

@@ -13,19 +13,5 @@
     <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.250606001" />
   </ItemGroup>
 
-  <ItemGroup>
-    <ApplicationDefinition Include="App.xaml" />
-    <Compile Include="App.xaml.cs" />
-    <Page Include="MainWindow.xaml" />
-    <Compile Include="MainWindow.xaml.cs" />
-    <Page Include="Components\Taskbar\Taskbar.xaml" />
-    <Compile Include="Components\Taskbar\Taskbar.xaml.cs" />
-    <Page Include="Components\StartMenu\StartMenu.xaml" />
-    <Compile Include="Components\StartMenu\StartMenu.xaml.cs" />
-    <Page Include="Components\SystemTray\SystemTray.xaml" />
-    <Compile Include="Components\SystemTray\SystemTray.xaml.cs" />
-    <Compile Include="Program.cs" />
-    <Compile Include="Services\WindowManager.cs" />
-  </ItemGroup>
 
-</Project>
+</Project>

mswindows/shell/MainWindow.xaml

@@ -2,8 +2,11 @@
     x:Class="LibreNT.Shell.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:local="using:LibreNT.Shell"
-    xmlns:components="using:LibreNT.Shell.Components"
+    xmlns:taskbar="using:LibreNT.Shell.Components.Taskbar"
+    xmlns:startmenu="using:LibreNT.Shell.Components.StartMenu"
     mc:Ignorable="d"
     Title="LibreNT Desktop"
     ExtendsContentIntoTitleBar="True">
@@ -24,18 +27,17 @@
                 Background="{ThemeResource SystemControlBackgroundBaseLowBrush}" />
 
         <!-- Taskbar (Windows 11 style - centered) -->
-        <components:Taskbar x:Name="MainTaskbar"
+        <taskbar:Taskbar x:Name="MainTaskbar"
                             Grid.Row="1"
                             HorizontalAlignment="Center"
                             VerticalAlignment="Bottom" />
 
         <!-- Start Menu (hidden by default) -->
         <Popup x:Name="StartMenuPopup"
-               Placement="Bottom"
                HorizontalAlignment="Center"
                VerticalAlignment="Top"
                Margin="0,0,0,60">
-            <components:StartMenu x:Name="StartMenuControl" />
+            <startmenu:StartMenu x:Name="StartMenuControl" />
         </Popup>
     </Grid>
 </Window>

mswindows/shell/MainWindow.xaml.cs

@@ -17,7 +17,7 @@ public MainWindow()
         Activated += OnActivated;
 
         // Initialize system tray
-        var systemTray = new SystemTray.SystemTray();
+        var systemTray = new SystemTray();
         MainTaskbar.SetSystemTray(systemTray);
 
         // Hook up start button

ntos2nd/CMakeLists.txt

@@ -58,6 +58,7 @@ set(NTOS2ND_HEADERS
     ntos2nd/apibridge.h
     ntos2nd/sandbox.h
     ntos2nd/undocumented.h
+    NTCall.h
 )
 
 # Create the kernel DLL
@@ -111,3 +112,25 @@ if(Cargo_FOUND)
         DESTINATION bin
     )
 endif()
+
+
+# POSIX subsystem runtime DLL (user mode)
+add_library(posixsubsystem SHARED
+    posix/runtime/posixsubsystem.c
+    posix/runtime/posixsubsystem.def
+    posix/include/posix_abi.h
+)
+target_include_directories(posixsubsystem PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/posix/include
+)
+target_link_libraries(posixsubsystem PRIVATE
+    kernel32
+)
+install(TARGETS posixsubsystem
+    LIBRARY DESTINATION lib
+    RUNTIME DESTINATION bin
+    ARCHIVE DESTINATION lib
+)
+install(FILES posix/include/posix_abi.h
+    DESTINATION include/ntos2nd/posix
+)