remove_apps_from_taskbar.ps1

function unpin_taskbar([string]$appname) {
    ((New-Object -Com Shell.Application).NameSpace('shell:::{4234d49b-0245-4df3-b780-3893943456e1}').Items() | Where-Object {$_.Name -eq $appname}).Verbs() | Where-Object {$_.Name.replace('&','') -match 'タスク バーからピン留めを外す'} | ForEach-Object {$_.DoIt()}
}

foreach ($taskbarapp in ("PowerPoint", "Excel")) {
    Write-Host "Unpinning $taskbarapp"
    unpin_taskbar("$taskbarapp")
}