Gigabyte archive in RAR format, 757 KB, labelled MQHUDVI-GB, which appears to be a board or product code rather than a standard motherboard model name. The name does not say whether the content is a schematic, boardview or firmware, so extract and inspect it first. Identify the exact Gigabyte product and revision printed on the PCB and compare it with the archive contents. If a firmware image is inside, back up the existing chip with a programmer before writing anything to it.
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 @SCHEMATICWORLD. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.