ASUS A78M-A motherboard boardview, revision 1.00, archived in a zip of about 99.5 KB. The A78 in the name refers to the AMD A78 chipset for socket FM2+ processors. A technician opens the extracted layout in a viewer such as OpenBoardView or FlexBV to find components, trace connections between pins and select test points when measuring VRM outputs, standby rails or the BIOS chip circuitry. ASUS prints the revision on the PCB, so confirm it matches 1.00 before relying on positions or net names.
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 @cynetitsolution. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.