Again Windows Shell not work

I buyed Coreldraw Graphic Suite x8 and i have Coreldraw x6 too. Why windows shell Coreldrawx8 not work, everytime i install new suite?To resolve i need to remove new windows shell and install old windows shell Coreldraw x6, to see preview cdr.
If i remove old windows shell coreldraw x6 and install only windows shell Coreldraw x8, preview not work with old cdr file Corel6.

This is a bug never solved. Is there some reason for this?
TKS