在c++或c#中打开密码保护Excel文件，提示输入密码，即使我传递了密码参数

I'm using the Microsoft.Office.Interop.Excel to open an password protected Excel file from my C++/CLI program. I supply a password as the 5th argument. When I run my program, Excel starts and opens my file but it prompts for password. Note that the file is password protected, not the worksheets.I'm using the Microsoft.Office.Interop.Excel to