Comment 3 for bug 220654

File-roller should open these files, hence it is a file-roller problem in my opinion. File-roller is a frontend to these various other utilities so I do not see why it can't be changed to use 7z instead of unzip, seeing as it uses 7z anyway for 7z files. This would solve the problem. 256 AES zips are being increasingly used in a corporate environment including mine, so I feel this issue is important.

As unzip hasn't been updated since 2005 (according to the changelog) it looks like this facility will not be included anytime soon, so an alternative approach needs to be taken.