title: Warning message if file name already exists when creating a pdf file
body: <p>I use the following macro to create a PDF file from my Excel spreadsheet:</p>
  
  <pre><code>Sub PDF_01()
  ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:= _
  ThisWorkbook.Path &amp; "\" &amp; "test.pdf", Quality:=xlQualityStandard, _
  IncludeDocProperties:=True, IgnorePrintAreas:=False, OpenAfterPublish:=True
  End Sub
  </code></pre>
  
  <p>This macro works fine so far. However, once I have created the file "test.pdf" and I run the macro again it will overwrite the first file without giving any warning message such as "The filename already exists. Do you want to overwrite it?".</p>
  
  <p>Do you know how I can include this message in my code?</p>