Boardview for board 19842-1, a number following Wistron's five-digit-dash design scheme, in a 106 KB RAR. The name gives no brand or model, though Wistron builds boards mainly for Dell, Acer and HP. Opened in a boardview program, it shows part locations and connected nets, useful for tracing power rails, locating test points and narrowing down a short. Before relying on it, match the 19842-1 label on your PCB, since Wistron numbers identify specific designs and revisions may change parts.
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 @schematiclaptopramkushwaha. 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.