I am sorry about asking aprobably stupid question. I have been using 7zip for many, many years, but rarely use it. And there seems to be NO WAY to figure out how get it working properly. IO click around and ztry around and sooner or later the result appears, but.... "Back in the good old days", I right-clicked a downloaded zip-file and "Opened with" 7zip, and I had the result. That no longer seems to work....
Works great, you probably have disabled contextmenu Go to options and restore. Open 7z => Tools => Options => 7-Zip (second table)