由 Christian Eyrich （開發者） 發表於 Jan. 16, 2010 · 永久網址

>have a Nikon D90 and the plugin says that the image is from a Nikon D60

Those informations aren't interpreted but contained in a string copied verbatim from the image. I've checked with some D90 images from flickr and FxIF always shows "D90".
But I'd be happy to check with your image if you could send it to me (you can also check it with some hex editor of other EXIF viewer).