7z and also versions of unzip older than 6.10b, don't support utf8 properly. Zip archives created on windows that have files with non-latin filenames show up as garbage.

Here's a sample zip archive that displays this problem:
http://pnboy.pinguix.com/gapan/23-10-2012-b-fasi-eaep.zip

Same problem is with cbz files, which are actually zip files.

Removing/commenting out lines 527 and 530 from src/fr-command-7z.c fixes this and opens zip files with unzip, but it removes the mimetypes from 7z completely.

Ideally, priority should be given to unzip first and if unzip is not present, fall back to 7z, if 7z is installed.