So the filenames on my D50 used to be DSC_xxxx.nef or .jpg. Recently I noticed that the filenames have changed so that they are now _DSCxxxx.nef or .jpg. I have looked through the menu to see if there is a way to change t back, but so far all I've seen is that I can reset the filename counter, but I don't want to do that. Anybody have any ideas as to how to fix this other than re-naming all of my files after I download them? Thanks in advance.