RAR archive labelled with the Quanta project code CT6, with no laptop brand, board number or revision stated in the name. At 949 KB it most likely holds a schematic or boardview set, but the contents should be confirmed after extraction. Quanta names its boards with a short project code and prints the full DA-prefixed number on the PCB, so compare that marking and revision before trusting the material. A schematic opens in any PDF reader, and boardview files need a viewer such as OpenBoardView.
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.