Suchen in mehreren Dateien

Sub In_allen_Mappen_suchen()
Dim wks As Worksheet
Dim rng As Range
Dim sAddress As String, sFind As String
sFind = InputBox("Bitte Suchbegriff eingeben:")
If sFind = "" Then Exit Sub
For Each wks In Worksheets
Set rng = wks.Cells.Find( _
what:=sFind, _
lookat:=xlWhole, _
LookIn:=xlFormulas)
If Not rng Is Nothing Then
sAddress = rng.Address
Do
Application.Goto rng, True
If MsgBox( _
prompt:="Weiter Suchen", _
Buttons:=vbYesNo + vbQuestion _
) = vbNo Then Exit Sub
Set rng = Cells.FindNext(after:=ActiveCell)
If rng.Address = sAddress Then Exit Do
Loop
End If
Next wks
MsgBox prompt:="Keine neue Fundstelle!"
End Sub

Kann mir jemand bei meinem Problem helfen?
Gruß Andreas