ASUS P8P67 LE motherboard file in a 252 KB RAR; the name gives only the model, which uses the Intel P67 chipset. At this size the archive probably holds a boardview or a short service schematic rather than firmware, so open it to confirm. Technicians rely on such data to follow CPU VRM and memory power, locate test points and identify parts that pull a rail to ground. Boardview formats are opened with tools like OpenBoardView or FlexBV. Always match the PCB revision to the document, because layouts can differ between ASUS board revisions.
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.