ASUS B150M-A repair guide catalogued as boardview material, packed in a 1.25 MB RAR archive. The name only states repair guide, so the contents may be a service document, a boardview file or both; extract it to see. Boardview data would open in a viewer such as OpenBoardView or FlexBV to locate components and test points. Either way, confirm the model and revision printed on the PCB before tracing rails or replacing parts based on it.
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.
7-ZipWinRARThe Unarchiver (macOS)