I downloaded NeverWinter Nights 2 Platinum torent (
http://thepiratebay.se/torrent/81591....NFO-BLACKCATS) which is all spanned 7zip archives. When I try to open any of the spanned files, I get crc errors. Also PA shows only a few files in the archive.
It was suggested on the torrent site to use 7zip itself, which I did and that worked fine. It also showed way more files. Here's some screenshots of the two programs:
PowerArchiver:
7zip:
Using latest version of PA 13.03.02
Showing 7-ZipDLL v9.20 for both PowerArchiver and 7zip