I've seen this too. avast! reports "[E] Archive is password protected. (42056)" when scanning clnsweep.cfg. When I saw this, I just assumed that the problem was caused by the use of a proprietary format that fooled the scanner into parsing it like a supported archive. However, I just opened this file with WinZip 8.1 SR-1 with no trouble; therefore, the archive is not password protected, and it doesn't have a proprietary format. It does contain files with odd names, however, like *.ocx+ and *.exe+.
Regards,
Hornus