RAR archive of 498 KB labelled GU605MI with the code NJU and an RTX 4070 GPU variant. The name identifies the model and graphics option but not the file type inside, so extract and inspect it before use; its size suggests a firmware component such as a VBIOS. Technicians flash such images with an SPI programmer to repair a corrupted ROM. Keep a backup of the existing chip, make sure the GPU variant matches your board, and check that the image matches the flash chip capacity.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @boardsscanrepo. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.