Archive for a board named IH61W-MHS, suggesting an Intel H61 chipset desktop design, 1.53 MB in ZIP form; manufacturer and contents are not given in the name. Most such packages hold a BIOS dump intended for writing to the SPI flash with an external programmer. Check the model printed on the motherboard and its revision first, open the archive to see what it actually contains, save a copy of the current chip contents and confirm that the image capacity matches the flash chip installed.
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 @schematicslaptop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.