Unable to open Excel file due to Null pointer reference

We have a file that when we feed the FileStream into the Workbook constructor, throws a null pointer exception. I will attach the file to this thread

9485CooperTest.zip (352.7 KB)

@cormack.milyli

It works OK with the latest version: Aspose.Cells for .NET 22.11

using (FileStream fs = File.OpenRead("9485CooperTest.XLSX"))
{
    Workbook wb = new Workbook(fs);
    Console.WriteLine(wb.Worksheets.Count);
}
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