Function Remove-InvalidCharacters {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [string]
        $String,
        [Parameter(Mandatory=$false)]
        $ReplacementCharacter = ''
    ) 

    $InvalidCharacters = [RegEx]::Escape(-join $([System.IO.Path]::GetInvalidFileNameChars()))

    return [RegEx]::Replace($String, "[$InvalidCharacters]", $ReplacementCharacter)
}