ASUS H61M-C archive, a 196 KB RAR with the model as the only detail in its name. The board is an Intel H61 LGA1155 micro-ATX design. Technicians generally use such packages as boardview references, loading them in OpenBoardView, FlexBV or a similar viewer to see component locations, net names and probe points while troubleshooting no-power, no-display or shorted rail faults. Check the file type after unpacking, and compare the PCB revision with the data before relying on it for measurements.
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.