I try to get the newest .xls file in a directory. Anyone sees why me method
brings up an error and doesnt find the files ? There are files in the ginven
directory.

Public ZMappe As String

Sub Auto_Open()

Dim Dat As Date
Dim DatVgl As Date
Dim Mappe As String

Const s = _
"F:\Siemens"
Mappe = Dir(s & "\*.xls")
Dat = FileDateTime(s & "\" & Mappe)

Do Until Mappe = ""
DatVgl = FileDateTime(s & "\" & Mappe)
If DatVgl Dat Then
Dat = DatVgl
ZMappe = s & "\" & Mappe
End If
Mappe = Dir()
Loop

Workbooks.Open Filename:=ZMappe

End Sub