MSI notebook board MS-16G1, revision 1.0 as indicated by r10, supplied as a 3.51 MB RAR archive with unspecified contents, most likely a schematic or boardview. MSI laptops use MS-16xx style numbers for their mainboards, printed on the PCB with the revision. A schematic lets you trace rails from the DC jack through charger and regulators, while a boardview locates components and test points. Match the board number and revision on the actual PCB before using component values or pin references from this package.
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 @alischematics. 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.