I think the zipper iconography was used by pretty early versions of pkzip, so it was definitely on the mind of the format's creator. Of course the more common i

I think the zipper iconography was used by pretty early versions of pkzip, so it was definitely on the mind of the format's creator. Of course the more common implementation WinZip (these days from Corel but I assume it was acquired, not sure of the history) went the C-clamp route, which I think it shared with WinRar.