PCB layout data, in boardview form, for the ASRock Z170M Pro4S micro-ATX motherboard at revision 1.02, zipped to around 389 KB. With it you can search a net name and see every pad it touches, identify components by designator and pick convenient probing points when checking voltages around the CPU VRM, memory slots or chipset. Viewers such as OpenBoardView and FlexBV handle these files. Compare the revision silkscreened on the board with 1.02 before trusting part positions.
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 @zinfo_desktop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.