HideTaskbarBtn.exe Hides or shows a window on the taskbar.

This uses the inbuilt compilers in Windows 10 - there are three VB.NET compilers and three C# compilers - just copy each text file into the same folder and double click the batch file to make the program.

Window Manipulation Posts

• Hide/Show Window
  
• Get Windows Rect
  
• Change Window Title
  
• Set a Window On Top or Not
  
• List All Windows
  
• Moves a Window
  
• Changes the Size of a Window
  
• Assigns a hotkey to a window
  
• Removes a window from the taskbar
  
• Starts a graphical program and returns when any of its windows is waiting for user input.
  

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Windows that are normal, a titlebar with a system menu, appear on the taskbar. Windows that want to appear on the taskbar but don't meet the requirements can set an extended window's style of an AppWindow. To remove a window from the taskbar requires the window to be hidden, the AppWindow extended style forcing it onto the taskbar to be removed and the extended style of a tool palette window applied. Then show the window. The new window won't have a titlebar icon.

This does not work with UWP apps, only Win32 applications and consoles.

If you run this on a minimised window there is no way of activating the window. See Assigns a hotkey to a window if you need to. If you run this on a non-minimised program then minimise the program a Windows 3.11 minimised desktop icon appears.

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@Echo Off
Echo HideTaskbarBtn.bat
Echo This file compiles HideTaskbarBtn.vb to HideTaskbarBtn.exe
Echo HideTaskbarBtn.exe hides or shows a window'a button on the taskbar
Echo To use 
Echo     HideTaskbarBtn Hide ^<Window Title^>
Echo     HideTaskbarBtn Show ^<Window Title^>
Echo E.G.
Echo     HideTaskbarBtn Hide Untitled - Notepad
Echo     HideTaskbarBtn Show Untitled - Notepad
Echo -----------------------------------------------------
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe" /target:winexe /out:"%~dp0\HideTaskbarBtn.exe" "%~dp0\HideTaskbarBtn.vb" 
pause

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'HideTaskbarBtn.vb
Imports System
Imports System.IO
Imports System.Runtime.InteropServices
Imports Microsoft.Win32

Public Module TopMost
	Public Declare UNICODE Function FindWindowW Lib "user32" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
	Public Declare Function SetWindowPos Lib "user32" (ByVal hwnd As IntPtr, ByVal hWndInsertAfter As Integer, ByVal x As Integer, ByVal y As Integer, ByVal cx As Integer, ByVal cy As Integer, ByVal wFlags As Integer) As Integer
	Public Declare Function SetWindowLongPtrW Lib "user32" (ByVal hwnd As IntPtr, ByVal Index As Integer, ByVal NewValue As Integer) As Integer
	Public Declare Function GetWindowLongPtrW Lib "user32" (ByVal hwnd As IntPtr, ByVal Index As Integer) As Integer
	Public Declare Function GetParent Lib "user32.dll" (ByVal hwnd As Intptr) As IntPtr

	Public Const WS_EX_APPWINDOW = &h40000
	Public Const WS_EX_TOOLWINDOW = &h80
	Public Const WS_MINIMIZEBOX = &h20000
	Public Const GWL_EXSTYLE = -20
	Public Const GWL_STYLE = -16

	Public Const HWND_TOPMOST = -1
	Public Const HWND_NOTOPMOST = -2
	Public Const SWP_NOMOVE = &H2
	Public Const SWP_NOSIZE = &H1
	Public Const SWP_SHOWWINDOW = &H40
	Public Const SWP_HIDEWINDOW = &H80
	Public Const SWP_NOOWNERZORDER = &H200      '  Don't do owner Z ordering
	Public Const SWP_NOREDRAW = &H8
	Public Const SWP_NOREPOSITION = &H200
	Public Const SWP_NOZORDER = &H4

	Sub Main()
		On Error Resume Next
		Dim hWindows as IntPtr
		Dim CmdLine as String
		Dim Ret as Integer
		Dim ExStyle as Integer
		Dim Style as Integer
		CmdLine = Mid(Command(),6)
		hwindows = FindWindowW(vbNullString, CmdLine)
		If hwindows = 0 then
			Msgbox(Cmdline & " cannot be found.")
		Else
			If LCase(Left(Command(), 4)) = LCase("Hide") then
				Ret = GetWindowLongPtrW(hWindows, GWL_EXSTYLE)
				ExStyle = Ret
				'Test AppWindow is set and if so remove it
				If (ExStyle And WS_EX_APPWINDOW) = WS_EX_APPWINDOW then ExStyle = ExStyle - WS_EX_APPWINDOW
				If (ExStyle And WS_EX_TOOLWINDOW) <> WS_EX_TOOLWINDOW then ExStyle = ExStyle + WS_EX_TOOLWINDOW
				Ret = SetWindowPos(hwindows, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE + SWP_NOSIZE + SWP_NOZORDER + SWP_HIDEWINDOW)
				Ret = GetWindowLongPtrW(hWindows, GWL_EXSTYLE)
				'SetWindowLongPtr does not clear GetLastError if sucessful.
				err.clear
				Ret = SetWindowLongPtrW(hWindows, GWL_EXSTYLE, ExStyle)
				If (Ret = 0 And err.LastDLLError <> 0) Then MsgBox("SetWindowLongPtrW is " & Err.LastDllError)
				err.clear
'				Ret = SetWindowLongPtrW(hWindows, GWL_STYLE, Style)
'				If (Ret = 0 And err.LastDLLError <> 0) Then MsgBox("SetWindowLongPtrW is " & Err.LastDllError)
				Ret = SetWindowPos(hwindows, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE + SWP_NOSIZE + SWP_NOZORDER + SWP_SHOWWINDOW)
				If Ret = 0 Then MsgBox("Set Pos Error is " & Err.LastDllError)
			ElseIf LCase(Left(Command(), 4)) = LCase("Show") then
				Ret = GetWindowLongPtrW(hWindows, GWL_EXSTYLE)
				'Test AppWindow is set and if so remove it
				ExStyle = Ret
				If (ExStyle And WS_EX_APPWINDOW) <> WS_EX_APPWINDOW then ExStyle = ExStyle + WS_EX_APPWINDOW
				If (ExStyle And WS_EX_TOOLWINDOW) = WS_EX_TOOLWINDOW then ExStyle = ExStyle - WS_EX_TOOLWINDOW
				Ret = SetWindowPos(hwindows, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE + SWP_NOSIZE + SWP_NOZORDER + SWP_HIDEWINDOW)
				If Ret = 0 Then MsgBox("Set Pos Error is " & Err.LastDllError)
				err.clear
				Ret = SetWindowLongPtrW(hWindows, GWL_EXSTYLE, ExStyle)
				If (Ret = 0 And err.LastDLLError <> 0) Then MsgBox("SetWindowLongPtrW is " & Err.LastDllError)
				Ret = SetWindowPos(hwindows, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE + SWP_NOSIZE + SWP_NOZORDER + SWP_SHOWWINDOW)
				If Ret = 0 Then MsgBox("Set Pos Error is " & Err.LastDllError)
			Else
				Msgbox("Command line not recognised")
			End If
		End If
	End Sub
End Module