I tested the exiftool utility this morning with Nikon 14-bit raw files for the Z9 (HE* .NEF) and D5 (Lossless Compressed .NEF):
TL/DR:
- The original file name IS NOT present.
- The original file name suffix (‘File Number’) value IS present.
- See attached file rows 3 and 321, for reference.
Details:
If the OP uses a standard prefix in their as-captured file naming (in the above example, “Z9A_” or “D5A_”) they could reconstruct the original file names by concatenating that prefix + the EXIF value shown in ‘File Number’ field:
Z9A_ + 1591 = Z9A_1591
If the shoot contains images from multiple cameras, they can derive the proper file name prefix from the ‘Serial Number’ in row 345.
Can also do this directly in PhotoMechanic by reading {snum}, translating that to the file name prefix (example: "Z9A_"), and then concatenating {frame}.
HTH