Find Cells With ONLY Specified Text

Got a question regarding the Range. Find function. I'm using it to search within the customer workbook, but while testing, I found something weird. Lemme give you an example:

This is my search code (please note, French version of Excel 2007, thus Feuil1 = Sheet1, and last row is 1048576) :

strName = Feuil1.Range("D13")
OpenFile ("Clients")
With Worksheets(1).Range("A1:A1048576")
Set SRange = .Find(strName, LookIn:=xlValues)
If Not SRange Is Nothing Then
CloseFile ("Clients")
FillCustomerInfo (strName)
Application. ScreenUpdating = True
Exit Sub
Else
Feuil1.Range("D15:D17") = " "
AjoutClient.Show
End If
End With.......................