Hi aspose comunity,
When i perform a list data validation, i get a correct drop down list with a .xls file, but when i save the same file with extension .xlsx i get values of the list in the same line(One line of values separated by ";" see attachements) . but what is surprising is when i select the list data and i go to the tab data->Data Validation) of the Excel file i find that the source list is good and after i click on save button without any change, i come back to the drop down list data and i find that the list become correct.
If you have meet the same problem an you have the solution, thank you to forward it.