ASRock Z170A-X motherboard boardview, revision 1.02, in a compact ZIP of roughly 329 KB. A boardview is the interactive counterpart of a schematic: clicking a pin reveals its net and every connected part, which speeds up locating short circuits, missing rails and broken traces. Use OpenBoardView, FlexBV or a similar viewer to open the extracted file. Before measuring, check that the revision printed on the PCB matches 1.02, because component placement may shift between board versions of the same model.
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.