I missed this explanation in the post you mentionned.
My Canon only create .CR2 files, to be compatible with DxO OpticsPro v5 and v6, I added this to xnview.ini
Code: Select all
Companion_00=cr2:cr2.dxo
Companion_01=cr2:cr2.v6.dxo
Code: Select all
Companion_00=cr2:cr2.dxo
Companion_01=cr2:cr2.v6.dxo