I'm not quite sure about what you just said... I've always used winRAR to perform these little operations and i do have 7zip, i don't use it often, but it's there.
"extract via the rar file not the r00 that is the second file not the first file in the series"
Assuming what you just said, I accessed the iso through winRAR--->Found the ISO file ".RAR"--->Extracted to a file on my desktop--->I end up with only the .RAR file, it does nothing.
I'm not entirely sure what you want me to do here...