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$FolderBrowserDialog = New-Object System.Windows.Forms.FolderBrowserDialog
if($FolderBrowserDialog.ShowDialog() -eq 'OK'){
    $DirName = $FolderBrowserDialog.SelectedPath + "\*"
    Get-ChildItem $DirName -include *.xml | foreach-object{
        $content = Get-Content $_
        $newname = "/xx/xxxxxxx/xxx/" + $_.name.SubString(15,4) + ".html"
        $content -replace "/xx/xx/xx/xx.html", $newname | Set-Content $_
    }
}