Zip archive of 2.68 MB named H61MXP, apparently an Intel H61 micro-ATX desktop motherboard; no revision or content list appears in the name. Archives of this size usually carry a BIOS dump used to recover a bricked board through an SPI programmer. Before relying on it, confirm the model and revision printed on the PCB, read and save the existing chip contents as a fallback, and make sure the image length equals the chip capacity, otherwise the write will fail or the board will not start.
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.