ASUS B150M-D motherboard repair guide, a RAR archive of about 1.60 MB. It is bench material for diagnosing power, boot and display faults, usually describing the startup sequence, which rails to measure and where failures commonly occur. No board revision appears in the name, so read the version silkscreened on the PCB before following component references. Open with 7-Zip or WinRAR; the file name does not say what document formats are inside.
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)