Lighttpd

I have a screenshot . Using lighttpd LightTPD/1.4.21-1 (Win32). I have tested on 2 machine. One on windows xp sp2 and another is windows 2003 enterprise edition sp2. Both shows same result. Those japanese characters are not visible on dir listing.

Seems like a bug that is only present on windows. Maybe the cygwin wrapper can't handle those?
It is not a bug in lighty though as I have tested it with linux and also asked moo (who is chinese) to test and it worked for both of us.

Windows handles Unicode and other encodings completely differently than Unix, and it's up to Cygwin to translate this. Googling doesn't show much information, other than this patch for an old version:

http://www.okisoft.co.jp/esc/utf8-cygwin/
http://www.mail-archive.com/cygwin-patches@cygwin.com/msg03702.html

This is almost certainly the correct thing to do--it's a clean, centralized approach, and there's no avoiding the performance hit for the UCS16<->UTF-8 conversions. Some Cygwin guy rejected it out of hand, and as far as I can see they've never implemented anything else. A year and a half later Cygwin apparently still has no support for internationalization, when the rest of the world made that leap years ago. Sometimes, open source is very embarrassing.

So, if you want multilingual support in Windows, it looks like the best you can do is to dig out that old version of Cygwin and apply that patch. Or, try to apply it to the current version, which may not be too hard, since the bulk is self-contained.

Thanks for the more detailed information peto!
I searched for related stuff too but didn't find the stuff you found. Well, to be honest I only search for cygwin + readdir bugs :)
Thanks again, it's really appretiated.

(Two and a half years.)