Smeeeprig

At present I'm installing 7-zip 3.13 with RunOnceEx.cmd using the "-y /q /r:n" switch but I've noticed that it doesn't set up file association. I've tried searching here and the 7-zip forum with no luck really. So does anyone know how to set up association for zip, rar and 7z files through the registry. Also how would I go about changing the context menu for 7-zip through the registry. I want it to only disply "open archive", "Extract files" and "Extract to <folder>".