WindowsTaskbarRemoval

A lightweight Windows utility that suppresses the native Explorer taskbar using the Windows AppBar API, with automatic recovery when Explorer restarts and a clean system-tray exit path.

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Purpose

WindowsTaskbarRemoval is designed for scenarios where the Windows taskbar must be permanently hidden without relying on auto-hide, group policy, or shell replacement. Common use cases include kiosk deployments, custom launcher environments, presentation machines, and any setup where an alternative shell component occupies the bottom screen edge and the native taskbar must not reappear.

The application hides the taskbar cleanly using the same shell interop mechanisms that Microsoft documents for third-party shell components. It survives Explorer crashes and restarts, restores the taskbar on exit, and requires no user interaction beyond the initial install.

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How It Works

The Core Mechanism

Windows exposes a flag through its shell interop layer (HideExplorerTaskbar) that instructs Explorer to hide its own taskbar window via ShowWindow(Shell_TrayWnd, SW_HIDE). This is the same mechanism used by alternative shell applications. Setting it to true causes the native taskbar to disappear; setting it back to false restores it.

Hiding the taskbar alone is not sufficient. The Windows shell reserves a strip of screen real estate at the bottom of the display (the "AppBar deskband") for the taskbar. If nothing else claims that space, other maximized windows will not use it correctly. WindowsTaskbarRemoval solves this by registering a ghost AppBar window at the bottom edge — a fully transparent, zero-height WPF window that holds the screen reservation, preventing layout gaps without being visible.

Explorer Restart Recovery

Explorer broadcasts the registered window message TaskbarCreated to every top-level window whenever it recreates its taskbar. This happens after an Explorer crash, after a manual restart via Task Manager, or during certain system updates. Without handling this message, a restarted Explorer would make its taskbar visible again, overriding the hidden state.

ExplorerMonitor maintains a lightweight native window (a raw NativeWindow message sink rather than a WPF window) that registers for TaskbarCreated via RegisterWindowMessage. When the message arrives, it marshals back onto the WPF dispatcher and instructs WindowManager to close and reopen the ghost AppBar, immediately re-suppressing the reborn native taskbar.

Graceful Shutdown

When the application exits — whether through the tray icon menu or a Windows session end event — WindowManager.Dispose() closes the ghost AppBar windows first (so the AppBar API can release the screen edge reservation cleanly via ABM_REMOVE), then sets HideExplorerTaskbar = false to restore the native taskbar. This ensures the desktop is always left in a usable state.

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Architecture

App (WPF Application)
  |
  |-- ShellManager          ManagedShell host; owns AppBarManager,
  |                         ExplorerHelper, and FullScreenHelper
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  |-- ExplorerMonitor       NativeWindow message sink
  |     |                   Registers for WM_TASKBARCREATED
  |     |                   Calls WindowManager.ReopenBars() on receipt
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  |-- WindowManager         Lifecycle controller
  |     |                   Sets HideExplorerTaskbar = true on startup
  |     |                   Sets HideExplorerTaskbar = false on Dispose
  |     |
  |     |-- TaskbarRemover  Ghost AppBar window (one per screen)
  |                         Zero-height, fully transparent
  |                         Holds bottom-edge screen reservation
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  |-- NotifyIcon            System-tray icon (WinForms)
                            Right-click menu and double-click to exit

Component Breakdown

Program.cs — Explicit entry point marked [STAThread]. WPF requires the UI thread to run as a Single-Threaded Apartment; declaring a manual entry point makes this unambiguous rather than relying on the XAML-generated entry point.

App.xaml / App.xaml.cs — Application lifecycle host. Initializes ShellManager at construction time, creates ExplorerMonitor and WindowManager on startup, tears everything down on exit, and owns the system-tray icon.

TaskbarRemover.cs — Subclass of ManagedShell's AppBarWindow. Registers as a zero-height, transparent WPF window at the bottom screen edge. The window is invisible to the user but satisfies the Win32 SHAppBarMessage geometry requirements that hold the screen reservation.

WindowManager.cs — Owns the list of active TaskbarRemover instances and the HideExplorerTaskbar flag. Responsible for opening bars on startup, reopening them when Explorer restarts, and restoring the native taskbar on disposal.

ExplorerMonitor.cs — Contains an inner NativeWindow that listens for the shell broadcast message TaskbarCreated. Uses a raw Win32 message sink rather than a WPF window to stay lightweight and to remain active before any WPF window has been created.

install.ps1 / install.bat — Installer and uninstaller. Copies the build output to %ProgramFiles%\WindowsTaskbarRemoval, registers a Windows Task Scheduler task under Detractless\WindowsTaskbarRemoval that launches the application at logon for all Administrators, and optionally removes everything cleanly.

build.ps1 / build.bat — Build helpers wrapping dotnet build and dotnet publish. Support Debug and Release configurations, and optionally produce a self-contained single-file executable via PublishSingleFile.

Dependencies

Dependency	Purpose
.NET 8 (net8.0-windows)	Runtime framework
WPF	Window and application model
Windows Forms	System-tray NotifyIcon
ManagedShell (v0.0.330)	AppBar API, ExplorerHelper (HideExplorerTaskbar), ShellManager

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Requirements

• Windows 10 or Windows 11
• .NET 8 SDK (build) or .NET 8 Runtime (run)
• Administrator privileges (install/uninstall only)

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Building

A .bat wrapper is provided so PowerShell execution policy is handled automatically.

Debug build (default)

build.bat

Release build

build.bat Release

Release self-contained single-file executable

build.bat Release publish

Output locations:

Mode	Output path
Debug	WindowsTaskbarRemoval\bin\Debug\net8.0-windows\
Release	WindowsTaskbarRemoval\bin\Release\net8.0-windows\
Publish	WindowsTaskbarRemoval\bin\Release\net8.0-windows\win-x64\publish\

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Installing

The installer must run as Administrator. Double-clicking install.bat triggers an automatic UAC elevation prompt.

install.bat

The script presents two options:

• A — Install: Copies the build output to %ProgramFiles%\WindowsTaskbarRemoval and registers a Task Scheduler task at Detractless\WindowsTaskbarRemoval that runs the application at logon for all users (standard accounts and administrators alike). The executable is also launched immediately for the current user without waiting for the next logon.

• B — Remove: Terminates any running instance, restarts Explorer to ensure the native taskbar is restored, removes the scheduled task, and deletes the install directory.

The installer searches the following paths for the executable, in order:

1. The script's own directory
2. WindowsTaskbarRemoval\bin\Release\net8.0-windows
3. WindowsTaskbarRemoval\bin\Debug\net8.0-windows
4. bin\Release\net8.0-windows
5. bin\Debug\net8.0-windows

Build the project before running the installer.

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Running Without Installing

The executable can be run directly without the installer. Launch WindowsTaskbarRemoval.exe from the build output directory. The taskbar will be hidden immediately. Exit via the system-tray icon (right-click, then "Exit WindowsTaskbarRemoval", or double-click) to restore the taskbar and terminate cleanly.

Do not terminate the process via Task Manager's "End task" without first exiting through the tray icon. Killing the process without a graceful shutdown will leave the native taskbar hidden until Explorer restarts.

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Uninstalling Manually

If the installer is unavailable, the following steps restore the system to its original state:

1. Right-click the tray icon and select "Exit WindowsTaskbarRemoval", or end the process through Task Manager and then restart Explorer (explorer.exe).
2. Remove the scheduled task: open Task Scheduler, navigate to Detractless\WindowsTaskbarRemoval, and delete it.
3. Delete %ProgramFiles%\WindowsTaskbarRemoval.

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Limitations

• Multi-monitor support is not currently implemented. The ghost AppBar is registered on the primary screen only. Secondary monitors retain their default taskbar behavior.
• The application runs as the logged-on user (manifest level asInvoker). No elevated privileges are required at runtime.
• The scheduled task principal is BUILTIN\Users, so the application runs at logon for all local user accounts, including standard (non-administrator) accounts.