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* Check if the file is secured with a password if so, remove it;
* If the file was generated by a third party software, the problem can be with the software used;
==== <span id="StrictOOXMLNotSupportedException">XLSX file in Strict Open XML format</span> ====
* TaticView does not support XLSX files that have been saved in ''Strict Open XML'' format. Try to save the file using the default Excel format. See how on [[Save File Supported Format]].
==== <span id="InvalidXLSFormatException">XLS file is in an invalid format</span> ==== <!--T:21-->
