RAR archive of 434 KB labelled for the Maximus V Gene, a micro-ATX desktop board name used in the ASUS ROG line, though the name itself lists no brand, revision or contents. At this size it most likely holds a boardview or a compact schematic set rather than a BIOS image, so open it and check before relying on it. A boardview lets you locate components, follow nets and probe test points when chasing a short or a missing rail. Confirm that the revision silkscreened on the PCB matches the document inside.
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 @boardview. 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.