Dahua DH-XVR5116HS-X 16-channel recorder package, a large 126 MB ZIP carrying the codes 66_148 and d1734 that appear to be board version and PCB identifiers. The size suggests a full flash dump or several files, possibly including update firmware. It is used to restore a recorder with corrupted firmware or a boot failure. Match the board markings before use, preserve the original flash contents, and make sure the image corresponds to the chip capacity fitted on your board.
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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.