Sub FindReplaceAllFilesInFolder()
Application.ScreenUpdating = False
Dim strFolder As String, strFile As String, strDocNm As String, wdDoc As Document
strDocNm = ActiveDocument.FullName: strFolder = GetFolder
If strFolder = "" Then Exit Sub
strFile = Dir(strFolder & "\*.docx", vbNormal)
While strFile <> ""
  If strFolder & "\" & strFile <> strDocNm Then
    Set wdDoc = Documents.Open(FileName:=strFolder & "\" & strFile, AddToRecentFiles:=False, Visible:=False)  
    With wdDoc
      Call FnR
      .Close SaveChanges:=True
    End With
  End If
  strFile = Dir()
Wend
Set wdDoc = Nothing
Application.ScreenUpdating = True
End Sub
 
Function GetFolder() As String
Dim oFolder As Object
GetFolder = ""
Set oFolder = CreateObject("Shell.Application").BrowseForFolder(0, "Choose a folder", 0)
If (Not oFolder Is Nothing) Then GetFolder = oFolder.Items.Item.Path
Set oFolder = Nothing
End Function


Sub FnR()
  Dim strFindText As String
  Dim strReplaceText As String
  Dim nSplitItem As Long
   
  Application.ScreenUpdating = False

  strFindText = "northenn,westenn"
  strReplaceText = "northern,western"
  
  nSplitItem = UBound(Split(strFindText, ","))

  ' Find each item and replace it with new one respectively.
  For nSplitItem = 0 To nSplitItem
    With Selection
      .HomeKey Unit:=wdStory
      With Selection.Find
        .ClearFormatting
        .Replacement.ClearFormatting
        .Text = Split(strFindText, ",")(nSplitItem)
        .Replacement.Text = Split(strReplaceText, ",")(nSplitItem)
        .Format = False
        .MatchWholeWord = False
      End With
    Selection.Find.Execute Replace:=wdReplaceAll
  End With
Next nSplitItem

  Application.ScreenUpdating = True

MsgBox "DONE EXECUTION"
End Sub