Archive called ZTTECH, about 2.3 MB, whose name only seems to point to a brand and states no board model, revision or content type. The size is consistent with a firmware image for a small SPI chip, but it may hold other files, so open it and inspect it first. Identify the board through the markings on the PCB and compare them with any information inside. When reflashing, read and save the existing chip with a programmer first, and confirm the dump size matches the chip.
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 @biositechyangiyer. 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.