In reply to Adeline Wilcox.

Adeline, you could use PowerShell to automate the Excel application, open the XML file that you created from ExcelXP, and then automate the SaveAs operation...thus converting the file into the native file format. Something like this:

$Excel = New-Object -Com Excel.Application
$Excel.Visible = $false
$Excel.DisplayAlerts = $false
$WorkBook = $Excel.Workbooks.Open("$localPath\out.xml")
$WorkBook.SaveAs("$localPath\out.xlsx",51)
$WorkBook.Close