Compressed RAR archive named after the ASUS-style P8Q77-M desktop motherboard model, a micro-ATX board built around the Intel Q77 chipset. The name does not reveal whether it holds a BIOS image, schematic or boardview, so open it and inspect the contents first. At 491 KB it is too small to be a full 8 MB flash dump and more likely contains documents or a partial file. Confirm the board revision printed on the PCB before using anything inside, and keep a backup of the original SPI chip contents before any reflash attempt.
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.