Compressed RAR package of about 988 KB named McLaren-15, which reads as a project code name for a 15-inch notebook platform rather than a retail model. The name gives no brand, board number or revision, so the exact laptop cannot be confirmed from it. Archives of this size usually carry a schematic PDF used to trace power sequencing, clock and signal paths and to find test points. Extract it, read the title block for the real board number and compare it with the print on the motherboard before using it.
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 @generalschematics. 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.