Thanks for your quick response.
I attached sample archive files.
It includes ascii only filename and Unicode filename also.
They are compressed with some kind of zip application.
There are differences between result of compressed files.
But they conform a 11th bit of general purpose flag to store Unicode filename in local header and central header. You might find easily this flag in archiver file by searching local file header signature (0x04034b50) and central file header signature(0x02014b50).
So if 'The Unarchiver' detects 11th bit in zip file entry, it will extract in Unicode filename even though user already selects specific encoding.
In addition, Winzip implements Info-ZIP's Unicode Path Extra Field in ascii filename entry also. This might be helpful for additional info, not mandatory thing. I mean it's a just references.
I have to say thank you for making wonderful program again!