Quanta HK9 repair package in RAR format, 2.79 MB in size, with no further detail in the name about the documents inside. HK9 is a Quanta project code, the internal identifier this ODM uses for a laptop mainboard design, and it is normally visible on the board silkscreen. Unpack the archive to see whether it contains schematic PDFs or boardview data. Verify the project code and revision on the physical PCB first, because neighbouring Quanta designs can differ in power circuitry and connector pinouts.
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 @schematicslaptop. 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.