OLE2NotOfficeXmlFileException
OLE2NotOfficeXmlFileException is an exception that is thrown when trying to open a file that is not in the Office Open XML format using the OLE2 file format.
The OLE2 file format is an older file format used by Microsoft Office applications prior to Office 2007. It is based on the Compound File Binary Format (CFBF) and is not compatible with the Office Open XML format.
When this exception is thrown, it means that the file being opened is not a valid Office Open XML file and cannot be processed using the OLE2 file format. To resolve this issue, you may need to check if the file is indeed in the correct format and if it is not, convert it to the Office Open XML format before attempting to open it
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