Preview and Finder can't see my .RW2 files

I recently got a new camera (Panasonic GX7) which shoots the same raw file format .RW2 as my older Panasonic GF1 camera. My workflow is to convert the .RW2 files to .dng at import via Lightroom, and to save the .RW2 files as backup on a separate drive.

Just noticed that if I try to view any files from the new camera in Preview, I get a message "The file "_000xxx.RW2" could not be opened. Preview currently does not support this raw file format". Also looking at the files in Finder with Column View, no preview is available, just an icon. Same goes for the .RW2 files and the converted .dng files.

On my wife's Mac Mini running 10.9.4, all these files display as I would expect.

Question is, will Preview ever support this raw file format (from this camera - same file format displays just fine from older camera!) under OS X Lion? Or is the truth that "While you're running a Lion machine Preview ain't never gonna support this new-fangled camera's raw files"?

Can anyone advise?

Thanks in advance

Jim