Boardview package, about 6.79 MB, for Wistron board 203005-1. The name gives no laptop brand or model, only the Wistron six-digit board code with its version suffix, a pattern often seen on Dell boards. The larger size may mean extra files, such as a schematic, are bundled with the layout. Extract it and open the board file with OpenBoardView, FlexBV or a compatible viewer to locate parts and test points. Confirm the full 203005-1 number printed on the PCB before using it for diagnosis.
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 @BoardSchematic. 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.