I have thousands of RAW files that I've always saved in their original state (e.g. _DSC 2104) of which I now have dozens of that number in their respective files, thus showing that I am a creature of habit. I've always wondered if I edit the photo vigorously in RAW, saving file as a psd. file, does the Raw file then revert, as if untouched, back to its original RAW file? Then, if I delete the .xmp file, is the file back to an untouched RAW file?
Then a more ignorant question: If I rename the files do they simply have a different name, untouched as it were, then followed by the .xmp suffix?