I figured out that access into shared folders is limited only for IPv4 protocol. FTP plug-in apparently have the same problem.
It's shame because Windows supports IPv6 from service pack 2 for Windows XP(eight years back).
I want to open this topic because IPv6 is not only about web pages on the Internet. It's about our home computers too because NAT* disappear with new protocol and they become a part of Internet.
Okay, it's not exactly "must to have" feature but you can gain a competitive advantage for little work
* NAT = http://en.wikipedia.org/wiki/Network_ad ... ranslation