Can't rip sprites...

[Koneko]

Hello! I have been trying to rip sprites for few hours already and can't seem to figure out what am I even supposed to do. I tried many methods and none of them work. 

I found some files that I assume contain sprites but they don't even have an extension. 

https://www.mediafire.com/file/26apxkp6v.../files.rar

So... Some help, please?..