Boardview for the ASUS H81M-C desktop motherboard at revision 1.0, compressed into a 119 KB RAR archive. Once extracted, the file opens in boardview software such as OpenBoardView or FlexBV, letting you click a part to see its nets, highlight a power rail across the board and find convenient test points for measuring with a multimeter. It is especially helpful when tracking down a short on the CPU or memory supply. Make sure the board in hand is also revision 1.0, as a 1.01 layout exists separately.
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.