RAR archive for the Quanta SW6C board at revision 1A, a 624 KB file whose name does not identify the finished laptop. It is a separate variant from the SW6H, so match the suffix carefully. The contents are probably a schematic, which helps a repair technician locate fuses and MOSFETs, measure rails at test points and work out why a board will not power on. Extract it and check that the title block code and revision agree with the markings printed on your motherboard.
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.