Option Explicit
Private Sub CommandButton1_Click()
Application.ScreenUpdating = False
Dim StrMMSrc As String, StrMMDoc As String, StrMMPath As String, StrName As String
Dim i As Long, j As Long
Const StrNoChr As String = """*./\:?|"
Dim wdApp As New Word.Application, wdDoc As Word.Document
wdApp.Visible = False
wdApp.DisplayAlerts = wdAlertsNone
StrMMSrc = ThisWorkbook.FullName
StrMMPath = ThisWorkbook.Path & "\"
StrMMDoc = StrMMPath & "abc.docx"
Set wdDoc = wdApp.Documents.Open(Filename:=StrMMDoc, AddToRecentFiles:=False, ReadOnly:=True, Visible:=False)
With wdDoc
  With .MailMerge
    .MainDocumentType = wdFormLetters
    .OpenDataSource Name:=StrMMSrc, ReadOnly:=True, AddToRecentFiles:=False, _
      LinkToSource:=False, Connection:="Provider=Microsoft.ACE.OLEDB.12.0;User ID=Admin;" & _
      "Data Source=StrMMSrc;Mode=Read;Extended Properties=""HDR=YES;IMEX=1"";", _
      SQLStatement:="SELECT * FROM `Sheet1$` where (Anz>0)"
    For i = 1 To .DataSource.RecordCount
      .Destination = wdSendToNewDocument
      .SuppressBlankLines = True
      With .DataSource
        .FirstRecord = i
        .LastRecord = i
        .ActiveRecord = i
        If Trim(.DataFields("ID")) = "" Then Exit For
        StrName = .DataFields("ID")
      End With
      .Execute Pause:=False
      For j = 1 To Len(StrNoChr)
        StrName = Replace(StrName, Mid(StrNoChr, j, 1), "_")
      Next
      StrName = Trim(StrName)
      With wdApp.ActiveDocument
        .SaveAs Filename:=StrMMPath & StrName & ".docx", FileFormat:=wdFormatXMLDocument, AddToRecentFiles:=False
        .Close SaveChanges:=False
      End With
    Next i
    .MainDocumentType = wdNotAMergeDocument
  End With
  .Close SaveChanges:=False
End With
wdApp.DisplayAlerts = wdAlertsAll
wdApp.Quit
Set wdDoc = Nothing: Set wdApp = Nothing
Application.ScreenUpdating = False
End Sub