Public/Remove-NTDiacritics.ps1

function Remove-NTDiacritics
{
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true,
                   ValueFromPipeline = $true)]
        [String]$inputString
    )
    Process
    {
        $objD = $inputString.Normalize([Text.NormalizationForm]::FormD)
        $sb = New-Object Text.StringBuilder
        
        for ($i = 0; $i -lt $objD.Length; $i++)
        {
            $c = [Globalization.CharUnicodeInfo]::GetUnicodeCategory($objD[$i])
            if ($c -ne [Globalization.UnicodeCategory]::NonSpacingMark)
            {
                [void]$sb.Append($objD[$i])
            }
        }
        
        $sb = $sb.ToString().Normalize([Text.NormalizationForm]::FormC)
        return $sb
    }
    
}