We have a number of customer Excel files that contain Microsoft Graph charts and attempting to open them with Aspose.Cells causes a null reference exception:
System.NullReferenceException : Object reference not set to an instance of an object.
at ..( ) at ..( ) at ..(MemoryStream ) at ..( ) at Aspose.Cells.Workbook.(Stream , LoadOptions , Boolean )
I understand that these are not supported (and attempting to open them in Excel displays the “Cannot open Microsoft Graph chart gallery files” message), but I would like to request an enhancement to have Aspose.Cells throw a CellsException with Code=ExceptionType.UnsupportedFeature rather than a null ref exception. An example file is attached.