Nikon D3 - Manual (Page 322)

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File Naming
Photographs are saved using file names consisting of “DSC_” or, in
the case of images that use the Adobe RGB color space, “_DSC”,
followed by a four-digit number and a three-letter extension (e.g.,
“DSC 0001.JPG”). The [File naming] option is used to select three
letters to replace the “DSC” portion of the file name. For
information on editing file names, see steps 2 and 3 of “Renaming
Shooting Menu Banks” (pg. 292). Note that the portion of the
name that can be edited is a maximum of three characters long.
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Extensions
The following extensions are used: “.NEF” for NEF (RAW) images, “.TIF” for
TIFF (RGB) images, “.JPG” for JPEG images, and “.NDF” for dust off reference
data.
Slot 2
Choose the role played by the secondary card slot when two
memory cards are inserted in the camera (pg. 71).
Image Quality
Choose image quality (pg. 65).