Mystery: How can RAW file spontaneously change to jpg file?

Although I have been using iPhoto 6 for some time I just noticed for the first time something strange when I dragged a NEF file (RAW Nikon file) from iPhoto and dropped it onto my desktop. What happened was that the NEF file suddenly transformed itself into a jpg file when I dropped it onto the desktop. Weird! I could hardly believe my eyes.
Later I noticed that the same thing happened when I dragged a NEF file from iPhoto and dropped it onto a Dock icon for Photomatix, a program for generating HDR images. The file opened up in Photomatix but it opened as a jpg file rather than as a NEF file. Holy Toledo!
What in the world is going on here? I hope that one of you iPhoto experts can tell me how NEF files can magically morph themselves into jpg files. I also need some expert advice on how to deal with this phenomenon.
By the way, I have converted many NEF files in the Adobe Camera RAW plug-in of Photoshop Elements, but to the best of my knowledge they have never changed identity from NEF files to jpg files when I handed them off from iPhoto to Photoshop Elements. In fact, in iPhoto Preferences/Advanced I have checked the "Use RAW files with external editor" box. 
Bob

Bob
No mystery whatever,
When you import a RAW file into iPhoto it automatically creates a JPEG preview of the file. That’s what you happen to be looking at in the iPhoto Window. Drag it out and you always get the current version of the file. Want to get the Original - select the pic in the iPhoto Window and go File -> Export and select the Original in the dialogue and you’ll get your NEF.
This is all covered in the Help. Now what help do you need to “deal with this phenomenon.“?
By the way, I have converted many NEF files in the Adobe Camera RAW plug-in of Photoshop Elements, but to the best of my knowledge they have never changed identity from NEF files to jpg files when I handed them off from iPhoto to Photoshop Elements. In fact, in iPhoto Preferences/Advanced I have checked the "Use RAW files with external editor" box.
How did you save them to iPhoto? Because you change the format from NEF to JPG then you must save them to the desktop and then import the JPEG to iPhoto.
Regards
TD

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