Registry check problem

When I use the registry checker, I always get this message:

Unused File Extension .DVR HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.DVR

How can I get rid of this error?

I am using version 2.33.1184 of CCleaner, HP Pavilion desktop PC, VISTA home.

I seen this on another forum

http://forum.notebookreview.com/windows-os-software/269265-whats-dvr-registry-key-64-bit-vista-system.html

Please read my signature

also, dvr maybe there for windows media center (or or components of that program)