Boardview for the ASUS A8N5X motherboard, packed as a 703 KB RAR archive; no board revision appears in the name. The file maps component locations and net connections, which helps when following a signal, locating test points and narrowing down a short on a power rail. Extract it and open in OpenBoardView, FlexBV or a compatible viewer. Because the revision is unstated, compare the revision silkscreened on your PCB and the placement of a few key parts against the file before trusting it for detailed work.
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 @IT_SERVICE_WORLD. 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.