RAR archive of about 541 KB carrying the ASUS P9X79 DELUXE motherboard name, without any revision or description of its contents. Unpack it with a standard archiver to identify whether boardview, schematic or other data is included. Technicians use such files to locate components and test points, trace CPU and memory supply rails, check power sequencing and narrow down shorts on these feature-heavy boards. Match the revision silkscreened on the PCB with the one in the documentation before taking measurements.
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.