Archive for the ASUS Maximus VI Extreme, the top board of that ROG generation, packed as a 650 KB RAR. The name states no revision or content type, so unpack it and check what it holds before relying on it. Layout data would open in an FZ-compatible viewer to help trace power rails, locate parts and find test points on this large board. Firmware content would require a backup of the original flash first, and the PCB revision should be checked either way.
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.
7-ZipWinRARThe Unarchiver (macOS)