H61M-P20 (G3) motherboard archive, a 2.96 MB zip. The G3 suffix appears to identify a specific board generation or revision, and the model implies an Intel H61 micro-ATX platform. The name gives no file list, so extract and check whether it holds a BIOS image or other documents. Check that the PCB silkscreen matches H61M-P20 G3, since other generations can need different firmware. Back up the existing SPI flash 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 @laptopchiplevelrepair. Enginerys does not host this file.
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Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip