I had an issue with running 7-zip after installing it until I figured it out. I see that others have had this problem (upon searching the web): thus, adding another item to the FAQ would help.
After installation, it is common to go to Windows Settings to associate 7-zip with .zip files. Not knowing better, in going to C:\Program Files\7-Zip to find the most logically named .exe to associate with .zip, one finds .7z … and that wasn’t the right choice. Only later did I see that .7zFM is the right choice.
Adding this info to the FAQ for people new to 7-zip would be useful!