Archive in RAR format for the MSI MS-163B1 board at revision 0A, roughly 1.06 MB. The trailing digit after the B suggests a sub-variant of the MS-163B design, so confirm the full code on the PCB. MSI numbers laptop boards in the MS-1xxx range. The name does not describe the contents; extract with WinRAR or 7-Zip and check for schematic or boardview files. A technician uses such documents to trace the power path, read voltages at test points, identify components and find the cause of a short.
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.