Hi.
This post is made due to CCleaner's fault of deleting some of the registry entries. In my case - it is simply one.
Some of helpers before told me it is associated with an Avira Free edition anti-virus. Here it is...
__________
Unused File Extension
{80b8c23c-16e0-4cd8-bbc3-cecec9a78b79}
HKCR\{80b8c23c-16e0-4cd8-bbc3-cecec9a78b79}
__________
It is exactly what CCleaner alerts.
Thanks in advance!
-Peter
P.S. From my experience, I know that one registry keys are related to others. Might be I need a deep registry scan by some other software to identify what other registry entries are related to this specific key to batch remove it, or keep.