Excel XLSX Libraries Add-on
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To import spreadsheet data from Excel 2007 or newer (.xlsx), Oxygen XML Editor needs additional libraries from the Apache POI project. Oxygen XML Editor offers an add-on that provides this support.

To add this support, follow this procedure:
  1. Go to Help > Install new add-ons to open an add-on selection dialog box.
  2. Enter or paste http://www.oxygenxml.com/InstData/Addons/default/updateSite.xml in the Show add-ons from field or select it from the drop-down menu.
  3. Select Excel XLSX libraries add-on and click Next.
  4. Select the I accept all terms of the end user license agreement option and click Finish.
  5. Restart the application.

    Result: You can now use the Import wizard to import data from Excel 2007 or newer.