Nikon D4 - File Naming

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Photographs are saved using file names consisting of “DSC_” or, in
the case of images that use the Adobe RGB color space (0 299),
“_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 page 180.
File Naming
G button ➜ C shooting menu
A Extensions
The following extensions are used: “.NEF” for NEF (RAW) images, “.TIF”
for TIFF (RGB) images, “.JPG” for JPEG images, “.MOV” for movies, and
“.NDF” for dust off reference data. In each pair of photographs recorded
at image-quality settings of NEF (RAW)+JPEG, the NEF and JPEG images
have the same file names but different extensions.