Gigabyte GA-H110M-S2P motherboard package in a 1.88 MB ZIP archive. The name states neither the revision nor the contents. The size suggests a schematic set or a combined schematic and boardview, but open it to confirm. Technicians use such material on Skylake-era H110 boards to trace standby and VCORE rails, check the power-on sequence and locate shorted MOSFETs or capacitors. Gigabyte issues several revisions of this model, so compare the revision printed on the PCB with the documents before trusting part values.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.