Powershell: Excel zu CSV - Trennzeichen ändern??

function Export-ExcelCSV{
[CmdletBinding()]
Param(
$ExcelWorkbook="$pwd\Test.xlsx",
$WorksheetName='Tabelle1'
)

Try{
Add-Type -AssemblyName Microsoft.Office.Interop.Excel
$xl=New-Object -ComObject Excel.Application
[void]$xl.Workbooks.Open($ExcelWorkbook)
$xl.Worksheets.Item($WorksheetName).Select()
$fi=[io.fileinfo]$xl.ActiveWorkbook.FullName
$csvfile=$fi.FullName.Replace($fi.Extension,'.csv')
Write-Verbose "Saving CSV to $csvfile"
$xl.ActiveSheet.SaveAs($csvFile,[Microsoft.Office.Interop.Excel.XlFileFormat]::xlCSV)
$xl.Quit()
}
Catch{
Throw $_
}
While([System.Runtime.Interopservices.Marshal]::ReleaseComObject($xl)){}
}
Export-ExcelCSV -Verbose