Folgendes PowerShell-Script zeigt mir in einem Verzeichnis mit unzähligen PDF-Dateien diejenigen an, für welche es eine Version mit %NAMEN%.pdf sowie %NAMEN%-native.pdf gibt:

$duplicateIndicator = "-native"

function Get-ScriptDirectory {
  $Invocation = (Get-Variable MyInvocation -Scope 1).Value
  Split-Path $Invocation.MyCommand.Path
}

$scriptDir = Get-ScriptDirectory

$pattern = "*" + $duplicateIndicator + ".pdf"
Write-Host "Looking for $pattern ..."
Write-Host ""

$counter = 0
Dir $pattern | ForEach-Object {
	$counter++
	
	$duplicate = $_.name
	$original = $duplicate -replace $duplicateIndicator, ""
	$originalPath = $scriptDir + '\' + $original
	
	#Write-Host $duplicate
	#Write-Host $original
	
	#Write-Host "Looking for original file $originalPath"
	$fileExists = Test-Path $originalPath
	
	If ($fileExists) {
		Write-Host "Found duplicate for "
		Write-Host "    $original"
		Write-Host ""
	}
	
	#Dir $original
}

Write-Host "Scanned $counter file(s)."
Write-Host "Done."
Write-Host ""