VeraEn

I am running win 7, ie11, both at the current latest levels. I have not installed any new programs in many months.  
 
registry cleaner detect a hit under File Types
 
expanding it shows:
 
,dds      HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/vnd.ms-dds\Extention
 
Start Clean does not fix it. i've searched and cannot find what is really wrong with that entry so I could edit it. I cannot detect any problems with my system, but that doesn't mean nothing is wrong. I first detected this 4 days ago.
 
question is how can I repair this entry ? I know how to use regedit.
 
Thank you for any replies.
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