General archive titled Motherboard Repair, 729 KB in RAR format, with no device, brand or board number stated. It is likely a guide or reference collection on motherboard fault finding rather than documentation for a specific board. Material of this sort usually covers power-on sequence, checking standby and main rails, identifying shorts and testing MOSFETs and regulators. Extract it with any RAR tool and treat it as background reading; for actual component values, use the schematic matching the board number on your PCB.
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 @generalschematics. 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.