It's a Nikon D40, the NEFs are supported by the OS.

And while I know it's not a replacement for iPhoto or Aperture, unless it supports Exif or IPTC metadata it's pretty useless as a photo app. Any tags you add with the app right now, for instance, will be lost if you send the pics to a Windows user and simply will not be recognised by any Photo app on any system. Would you claim an app as a Music organiser if it didn't support ID3 tags?

I can see no way to "please add the extension to recognized items", it's simply a NEF file with a NEF extension that's recognised by the OS, iPhoto, Aperture and everything else that claims to be a photo application.

But let's not take this any further. I'll simply be amused that you add Raw support for users of Raw formats but not Exif or IPTC support. Do you really think there are many users out there who shoot Raw and don't know what standard metadata is?

As you have no interest is supporting Standards I no longer have any interest in your app. I'm sure it's a fine file browser, but as I said above, would you dare call an app that ignored ID3 tags a "Music Organiser"? Then it's a bit of a cheek to call an app that not only ignores standard metadata but dares to substitute non-standard metadata in its place a "Photo Organiser". Shame.

React like what? I note that you have no interest in supporting standard metadata and so, as this is important to me, I have no further interest in your application. I think it's a shame that you won't support the standards - an opinion that I am entitled to. But that's your choice and your entitled to that. I just happen to think it's a lesser app because of it.