H81M-CS motherboard package, a 10.0 MB zip, without revision in the name. The model suggests an Intel H81 micro-ATX desktop board; the large size hints the archive may hold several files, such as multiple BIOS versions, a dump plus tools, or service documentation. Review everything before use. When reflashing, read and keep the original SPI chip contents, pick the image matching the board revision printed on the PCB, and confirm its size equals 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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip