Firmware package labelled m70z, most likely the Lenovo ThinkCentre M70z all-in-one, for a Quanta board numbered DA0QU9MB6C0. The 3.82 MB ZIP should hold a BIOS dump for reprogramming the SPI flash when the unit will not power on, shows no display or has a damaged image. Quanta board codes are printed on the PCB, and the final letter and digit indicate the revision, here C0. Compare that code with your board, dump the existing chip as a backup first, and make sure the image size matches the chip density before you flash it.
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 @biosarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →