Hello.
I would like to suggest feature for zip archive file.
Windows Winzip or other Unicode support zip application try to reserve maximum compatibility with legacy zip archive file.
So when Winzip make archive file in particular locale windows, it use specific codepage filename and Unicode same time. If filename can be encoded into windows related codepage( such as CP949 CP936...), it use these codepage.
But if filename can't be converted into local codepage, Winzip use Unicode filename.

As a result, archive file has local codepage filename and Unicode filename in UTF-8.
Fortunately, when Unicode filename is used, 11th bit of general purpose bit flag is set.
We can classify these two different encoding.

Currently in The Unarchiver, it might not aware of this difference. So when I designated specific filename encoding, it will try to extract only one encoding which I gave.

So I would like you to add feature that recognize zip format's 11th bit of general purpose flag. You can found these info. on PKWARE's AppNote.

http://www.pkware.com/documents/casestudies/APPNOTE.TXT

Sincerely
trip2me