Serving files with non-Latin-1 html file names

[MinHyeong-Lee]

Hello

Our users want to attach *.html files.

But, there is some problem.
When file name have non latin-1 character, error occured like this.

When I attach file name with non latin-1 html file,
and I try to download this file, error always occurs.

How can I fix it?

Thank you