RAR archive of 100 KB labelled A78M-E 1.03A, apparently a duplicate copy of the same file under a slightly different name. Neither brand nor content type is given, so open it to see whether it holds a boardview, schematic or firmware for this board. For layout data, match the revision on the PCB to 1.03A before trusting part positions. For a firmware image, read and save the existing flash chip with a programmer first, and confirm the dump size equals the chip capacity before writing.
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 @cyberlanelectonik. 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.