Repair guide package for the ASUS Z170M-PLUS, a micro-ATX motherboard built on the Intel Z170 chipset, compressed as a 1.22 MB RAR archive. Guides of this kind usually describe the standby and main power sequence, VRM and memory rail checkpoints, and the measurement points used to localise shorts or missing voltages. Open it with 7-Zip or WinRAR, then read the contents in a PDF or image viewer. Check that the board revision printed on your PCB corresponds to the one covered before trusting specific readings.
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 @ZINFOSERVICECHANNEL1. 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.