title: SSRS ReportViwer Excel export format
body: <p>Export from ReportViewer produces an XLS file. That format has a limitation for a number of columns = 256. Is there any chance to generate XLSX file?</p>
  <p>The line that generates the file is this:</p>
  <pre><code>var bytes = rep.Render(&quot;EXCEL&quot;, null, out _, out _, out var extension, out _, out _);
  </code></pre>
  <p>Please, help.</p>
  <p>Thanks</p>
  <p>Figured out. I need to use &quot;EXCELOPENXML&quot;</p>