7z files have a better compression rate than
ordinary yip files.
You can download the free packer/unpacker from
http://www.7-zip.org
After installing 7-zip, use 7zFM.exe to get the
graphical program surface to open.
Go then in this file-manager to the downloaded
K-Meleon 7z file, highlight it and press the
"Extract" button.
Fred