I thought it was greyed out for DNG files but today I had a folder of 3FR ones needed to ne converted to DNG and it was still greyed out. PMP knew they are RAW because it moved them together with their XMP sidecars when I moved them into a subfolder after converting to DNG. How do I get that very useful menu item to actually select all the RAW files, including DNGs, in the current view?
Also, when I have only DNG and XMP files, PMP does not collate them together. Leica and Pentax support DNG natively. For Leica it is their RAW format, and for Pentax it is configurable. Please have an option to treat DNGs as full fledged RAWs.