title: 'C:\blp\API\Office Tools\BloombergUI.xla'! keeps adding itself onto my Excel Formula
body: <p>I have Bloomberg Excel Add-In installed on my computer and I have a VBA Function that check if the file exists in a folder:</p>
  
  <pre><code>Function FileExists(sPath As String)
      FileExists = Dir(sPath) &lt;&gt; ""
  End Function
  </code></pre>
  
  <p>I use that as part of my Excel cell formula. E.g.:</p>
  
  <pre><code>=FileExists([File_Name.xlsx])
  </code></pre>
  
  <p>And this returns me either <code>True</code> or <code>False</code></p>
  
  <p>This works fine by itself. However, from time to time when I open the file, I would find the formula becoming <code>='C:\blp\API\Office Tools\BloombergUI.xla'!FileExists([File_Name.xlsx])</code> for no apparent reason whatsoever and this results in error. </p>
  
  <p>Anyone else experienced this problem before? Are there any solutions to this?</p>