I have resaved the workbook (.xls → .xls) with Aspose.Cells and the result is opened in Protected View by MS Excel. The original workbook opens without any warnings.
I attached the workbook.
Code sample:
var wb = new …... Issue ID(s): CELLSNET-58080 You can obtain...inform you that your issue (Ticket ID: “CELLSNET-58080”) has been resolved...