bigned

Lately, every time I run Ccleaner registry scan I get this mesage: (under data) Unused file extension {80b8c23c-16e0-4cd8-bbc3-cecec9a78b79} (under registry key) hkcr\{80b8c-23c-16e0-4cd8-bbc3-cecec9a78b79} I have deleted ccleaner and reinstalled it and the problem continues. Can someone kindly give me a step by step (in laymans terms) how to get this to quit showing up after the registry scan? Thanks kindly