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* TaticView reads the first ten columns (on the first visible tab in XLS and XLSX files) of the file to detect the data columns. In case the columns are not found, the process is aborted;
==== <span id="InvalidXLSXFormatException"> <span id="NotOOXMLFileException">XLSX file is in an invalid format</span></span> ==== <!--T:19-->
* The file's structure does not respect the XLSX format. Try saving the file again using Excel. See how on [[Save File Supported Format]];
* 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;
