The WxWindows library supports ZIP files (see http://docs.wxwidgets.org/stable/wx_wxarc.html#wxarc).
This has also the advantage that you can look at the contents using a ZIP manager (e.g. WINZIP).
A commercial alternative is ChillKat (http://www.chilkatsoft.com/)
If security is a concern, encrypt the file contents and mangle the file names in the ZIP archive.