[Japo]

I can open and extract the old one with WinRAR for Windows x64 and PKZip for DOS. I'd try re-installing/updating WinRAR.

I've seen "unsupported operation" or similar messages from 7zip before when trying to drag-and-drop. It's not because of the archive, it's always fine if I use another extractor, I'm not sure but I suspect 7zip has a lot of "non-essential" features not implemented yet. It's a very powerful program regarding the compression ratios of the 7zip format and the other formats it supports, but feature-wise it's pretty poor.