Comments on the end of the file name ...
Good idea , but keep the first and important parts in English .
Thatway when somebody doesn't speak that particular (Korean in this case) language they can still understand what the file contains .

About using non-english caractars :
I don't think LW can do anything about it .
The Java runtime is to blame for that .

Put it in the ideas forum and I'm sure they will read it sooner or later .