ccleaner asks to close windows explorer

Hi, ccleaner asks to close windows explorer to clear mru files, but isn't that like shutting my operating system off?

nothing bad has happened when i've allowed it, but i don't know if i should continue to allow it.

I appreciate any input on this, to know if it is safe for me to close windows explorer when ccleaner asks.

thanks..

Are you sure it isn't asking to close Internet Explorer?

Hi.. It is asking to closes windows explorer..