param(
    [Parameter(Mandatory)]
    [string]$Path
)

$xml = New-Object System.Xml.XmlDocument
$xml.PreserveWhitespace = $false
$xml.Load($Path)

$directory = Split-Path $Path -Parent
$fileName  = [System.IO.Path]::GetFileNameWithoutExtension($Path)

$newPath = Join-Path $directory "${fileName}_new.xml"

$settings = [System.Xml.XmlWriterSettings]::new()
$settings.Indent = $true
$settings.Encoding = [System.Text.UTF8Encoding]::new($false)  # BOMなし

$writer = [System.Xml.XmlWriter]::Create($newPath, $settings)

try {
    $xml.Save($writer)
}
finally {
    $writer.Dispose()
}