After installing NCH's Axon PBX, all my zip files/folders had the right-click context menu "Extract with Express Zip". Apparently, these install-on-demand applications are standard fare with NCH software. However, like many of their users, I want to continue using their software without dealing with the nuisance "features" that come with the software.
It seemed like CCleaner should have been able to address the issue. I love it as a resource, and one of their tools allows you to examine customized context menus. However, these entries did not even appear. After much searching, I stumbled across ShellMenuView. It runs on most versions of Windows, and it allowed me to disable (not delete) the unwanted context menu items.