...would be great! NRW=NIKON; RAF=FUJIFILM

However, I've played around and added NRW to valid extensions. It works like a charm. But when I add RAF to the extensions list, it says:

/DCIM/108_FUJI/DSCF8797.RAF is not a valid media file. Skipping...

I can read the EXIF information with exiftool, where is the problem with this extension?