@agillis, I also had a ton of CD rips that came from my NAIM HDX.
There was no meta.naim, also not a hidden file. Paul summarized the files you should see in each folder of any NAIM imported CD.
I am almost done with my Flac conversion (with XLD using my Mac) and using SongKong on my Melco N1 as weil as Jaikoz on my Mac too to get metadata embedded into the music files.
Looking back I have to say that the NAIM files were not helpful at all as the metadata that the HDX pulled were really poor. There might have been a few CDs that were only available at the AMG database but in these cases the amount of metadata was kept flat.
Just my 2 cents and others might think differently.