title: PHPExcel corrupt file Drop down list not working Windows Excel Data validation
body: <p>If I use:</p>
  
  <pre><code>$objValidation-&gt;setType( PHPExcel_Cell_DataValidation::TYPE_LIST );
  $objValidation-&gt;setErrorStyle( PHPExcel_Cell_DataValidation::STYLE_INFORMATION );
  $objValidation-&gt;setAllowBlank(false);
  $objValidation-&gt;setShowInputMessage(true);
  $objValidation-&gt;setShowErrorMessage(true);
  $objValidation-&gt;setShowDropDown(true);
  $objValidation-&gt;setErrorTitle('Input error');
  $objValidation-&gt;setError('Value is not in list.');
  $objValidation-&gt;setPromptTitle('Pick from list');
  $objValidation-&gt;setPrompt('Please pick a value from the drop-down list.');
  $objValidation-&gt;setFormula1('"male,female"');
  </code></pre>
  
  <p>to create an excel file, I get the following errors on windows Excel</p>
  
  <pre><code>1. We found a problem with some content in 'filename.xlsx'. Do you want to recover....
  2. Removed Feature: Data validation from /xl/worksheets/shee1.xml part
  </code></pre>
  
  <p>If I comment that code out it opens normally.</p>
  
  <p>Works as expected on Ubuntu Libre Office.</p>