Display selected images in file manager/finder

I am trying to follow the instructions without success.
i want to rate some images, then select them and display only them in file manager or finder. Only 1 of the selected images are highlighted in either managers.
what i really want to do is pass the selected images to DXO pureraw, but it seems that DXO will process the images if a rate has been added; pity!
Any ideas how to follow this workflow?
TIA
Glyn