MSI MS-168A motherboard documentation packed as a RAR file, revision 0A, approximately 1.75 MB in size. MS-16xx numbers belong to MSI notebook boards, and the code is normally silkscreened near the board edge. The archive contents are not listed, so open it with 7-Zip or WinRAR to see whether it holds a schematic, boardview or both. These are used to follow power rails, locate test points and components and track down shorts. Make sure the PCB reads MS-168A rev 0A, since related MS-168 variants exist.
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 @IT_SERVICE_WORLD. 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.