错误 - 逻辑文件不是数据库的一部分。使用RESTORE FILELISTONLY列出逻辑文件名

I made a script to restore .bak or backup files. It works for some databases, but not for one. How do I make it work for any type of .bak file ? This is in sql server 2008. The error message is - I made a script to restore .bak or backup files