ASUS H110M-K D3 repair guide in a 1.26 MB RAR archive; the D3 suffix indicates the DDR3 memory variant of this H110M-K board, so it should not be confused with the DDR4 model. A technician uses this kind of guide to check standby and main voltages in order, locate key components and work through no-power or no-POST faults. Confirm the exact model and revision on the PCB before following measurements. Any RAR-capable tool opens the file; contents are not detailed by the name.
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 @ZINFOSERVICECHANNEL1. 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.