==== <span id="InvalidXLSXFormatException"> <span id="NotOOXMLFileException">XLSX file is in an invalid format</span></span> ====* The We are unable to read your ''XLSX'' file's , because the structure does not respect of the XLSX file is apparently in an invalid format. Try saving If the file was generated by a third-party software, it could be a problem in the program that generated the file. In this case, try the following:* Save the file again using Excel. See how on [[Save File Supported Format|here]];* Check if the If your file is secured with a password if soprotected, remove itthe protection;