I am using Aspose.Cells.dll for .Net version 126.96.36.199 to generate text file from the excelbook. If the excel sheet contains only shape collections, it is generating the empty text file. It is not extracting the text in the shapes.Please find the below code to generate the text file.
_workBook = new Workbook(fileName, loadOptions);
I have attached the sample excel document for your reference.