I have problems downloading Excel file with xlsx extension protected with password. 

 The problem is due OfficeOpenXml.ExcelPackage library. 

 We are saving a report with xlsx extension, if we use "save" method without password there isn't problems, if we pass password to this method ( save(password) ) file change format and becomes a xls file. 

 When we try to open this file (with .xlsx extension) it gaves us an error "format and extension of file.xlsx file isn't equals". 

 This library is the same in c# language, but in this language it works, so it is a bug of x++ library.

 If anyone else has experienced the same issue, please let us know so it can become more of a priority and they will fix it sooner.

 thank you 

 Babara