Failed to locate program lsar on disk
This solution may work for you. You need to install the package 'unar', and no that is not a typo. It stands for Unified Archive extractor or something. It's basically a back-end or go-between for Ark to handle multiple file types, such as rar.
Open up the konsole terminal, and type this:
sudo yum install unarI did not have to even restart KDE, but you may need to restart KDE or reboot before it takes effect.