lucy24 - 7:42 am on Sep 1, 2013 (gmt 0)
I suppose it would be a complete waste of time to say: Don't
I'm all for putting the content of any and all files into UTF-8. But filenames? That's not only your server. It's everything that the request meets in transit from user's browser, across the internet and into the server. And further complications if the file is linked from some third site.
AddCharset (mod_mime) and AddDefaultCharset (core) apply to the file's contents, not its name. Both should be viewed mainly as information you're giving the end user's browser.