Compressed RAR archive named after the Quanta SPJ platform, about 985 KB in size. Quanta is a major notebook ODM, and SPJ is one of its internal project codes; the name does not state the brand, laptop model or revision. Such packages usually contain a schematic used to trace power rails, follow signals and locate components during board-level repair. Look for the project code printed on the motherboard, often in a DAxxxx part number, and check the revision before trusting the circuit details.
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.