ASUS B150M-ET M2 repair guide supplied in a 1.59 MB RAR archive; the M2 suffix is part of the model name and refers to the variant with an M.2 slot. It helps when diagnosing boards that stay dead or stop before POST, typically covering power sequence, rail checks and common failure points. The name carries no revision, so compare the PCB silkscreen against the documents. Use WinRAR or 7-Zip to extract; the content format is not described.
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)