Pin or unpin applications to/from the taskbar

Add-TaskbarItem.ps1

function Add-TaskbarItem
{
<#
        .SYNOPSIS
        Adds or removes items from a user's taskbar
        
        .DESCRIPTION
        Adds or removes items from a user's taskbar. Supports pinning of multiple items using the pipeline.
        
        .PARAMETER Action
        Specifies whether to pin or remove an item from the taskbar. Valid values are "PinToTaskBar" and "UnpinFromTaskBar."
        
        .PARAMETER Path
        Specifies the path to the application to be pinned.
        
        .EXAMPLE
        Add-TaskbarItem -Action PinToTaskBar -Path c:\windows\system32\notepad.exe
        Pins notepad to the taskbar
        
        .EXAMPLE
        Add-TaskbarItem -Action UnpinFromTaskBar -Path c:\windows\system32\notepad.exe
        Removes notepad from the taskbar

        .EXAMPLE
        'c:\windows\system32\notepad.exe','c:\Windows\System32\ServerManager.exe' | Add-TaskbarItem -Action PinToTaskBar
        Adds Notepad and Server Manager to the taskbar simultaneously

        .EXAMPLE
        'c:\windows\system32\notepad.exe','c:\Windows\System32\ServerManager.exe' | Add-TaskbarItem -Action UnpinFromTaskBar
        Removes Notepad and Server Manager from the taskbar simultaneously
        
        .NOTES
        Adapted from a script module by Jan Egil-Ring

        Needs better error handling:
        - If the item is not currently pinned and you try to unpin it, the error returned is "Verb not found"
        - Same happens if you try to pin the same item twice
        
        .LINK
        http://blog.crayon.no/blogs/janegil/archive/2010/02/26/pin-and-unpin-applications-from-the-taskbar-and-start-menu-using-windows-powershell.aspx
#>

    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true)]
        [ValidateSet('PinToTaskbar','UnpinFromTaskbar')]
        [string]
        $Action,
         
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [string]
        $Path
    )
    
    BEGIN
    {
        function Invoke-Verb 
    {
        param
        (
            [string]
            $Path,
            
            $Verb
        )
    
        $Verb = $Verb.Replace('&','')
        $FilePath = Split-Path -Path $Path
        $Shell = New-Object -ComObject 'Shell.Application' 
        $Folder = $Shell.Namespace($FilePath)   
        $Item = $Folder.Parsename((Split-Path -Path $Path -Leaf))
        $ItemVerb = $Item.Verbs() | Where-Object -FilterScript {
            $_.Name.Replace('&','') -eq $Verb
        }
        if ($ItemVerb -eq $null) { throw "Verb $Verb not found." }
        else { $ItemVerb.DoIt() }
    }
    
    function Get-Verb 
    {
        param
        (
            [int]
            $VerbId
        )
        
        try { $t = [type]'CosmosKey.Util.MuiHelper' }
        catch 
        {
            $def = [Text.StringBuilder]''
            [void]$def.AppendLine('[DllImport("user32.dll")]')
            [void]$def.AppendLine('public static extern int LoadString(IntPtr h,uint id, System.Text.StringBuilder sb,int maxBuffer);')
            [void]$def.AppendLine('[DllImport("kernel32.dll")]')
            [void]$def.AppendLine('public static extern IntPtr LoadLibrary(string s);')
            Add-Type -MemberDefinition $def.ToString() -Name MuiHelper -Namespace CosmosKey.Util
        }
        if($global:CosmosKey_Utils_MuiHelper_Shell32 -eq $null)
        {
            $global:CosmosKey_Utils_MuiHelper_Shell32 = [CosmosKey.Util.MuiHelper]::LoadLibrary('shell32.dll')
        }
        $maxVerbLength = 255
        $verbBuilder = New-Object -TypeName Text.StringBuilder -ArgumentList '', $maxVerbLength
        [void][CosmosKey.Util.MuiHelper]::LoadString($CosmosKey_Utils_MuiHelper_Shell32,$VerbId,$verbBuilder,$maxVerbLength)
        $verbBuilder.ToString()
    }
    }


    PROCESS
    {
        if (-not (Test-Path $Path)) { throw "Path $Path does not exist." }
   
        $verbs = @{
            'PinToTaskbar'     = 5386
            'UnpinfromTaskbar' = 5387
        }
   
        if($verbs.$Action -eq $null)
        {
            Throw "Action $Action not supported`nSupported actions are:`n`tPintoStartMenu`n`tUnpinfromStartMenu`n`tPintoTaskbar`n`tUnpinfromTaskbar"
        }
        Invoke-Verb -Path $Path -Verb $(Get-Verb -VerbId $verbs.$Action)
    }
}