workaround the querySelectorAll bug that shows when calling it from COM+

findelems.in.html.ps1

$comDoc = New-Object -Com 'HTMLFile'
# load the wiki content
$res = Invoke-WebRequest $webLocation
# create a webview
$comDoc.Write( [System.Text.Encoding]::Unicode.GetBytes($res.Content) )
# query DOM
$elems = $comDoc.querySelector('table.prettytable')
# unfortunately querySelectorAll fails for various reasons
# so we have to enumerate the items manually
$codes = $elems.childNodes().item(0).childNodes() `
    | ForEach-Object { 
        $_.ChildNodes().item(5).innerText -match '(\w+)(?:\sor\s(\w+))*'; 
        ($matches[1], $matches[2]) } `
    | Sort-Object | Get-unique 

$codes -notmatch 'File' -join ' ' | Write-Host