I find out a way to resolve it after your kind comments so that I have a clue to find about "Windows ASCII"...bla...bla.
I get a post real similar to mine. I follow its answer to get the useful hints via google to get a online tool.
What I refer this article to get the hints.
How to encode and decode Broken Chinese/Unicode characters?
The useful tool to converter online to make the garbled word to be readable.
Online Character Set Fixer
This article mentions the uploaded file while I download it which is converted to UTF-8. Originally, it is "Windows-1252 encoded". So, I find a useful tool to make it.
The answer is here.
"×ÔÓÃ²Î¿¼_config_Ó³Éä¼ü_¿ì½Ý¼ü" => "自用参考_config_映射键_快捷键"
Thanks all of you.