title: OPC Compliance error [M4.1] error related to incorrect user file
body: <p>I have faced with a problem that when I am trying to import my excel file in program I am getting the next error:</p>
  
  <pre><code>OPC Compliance error [M4.1]: there is more than one core properties relationship in the package !
  </code></pre>
  
  <p>There is a lot of suggestions about this issue. One of the is just copy past all data to the new file and it does the trick.(It does)</p>
  
  <p>But I have a lot of files and I cant just recreate all of them before import to the program.</p>
  
  <p>I am importing xls. and .xslx files using Apache-POI version 3.5-FINAL(pretty old I know it, but I have to work with it).</p>
  
  <p>Is there any suggestions to not recreate file? Maybe it some configuration in OS Windows can help ?</p>