A compact 103 KB PDF labelled 20BQ030, filed among schematics. The name contains no laptop model, board number or revision, only a code shaped like an International Rectifier small Schottky diode part number. Treat it as a component datasheet with ratings, characteristic curves and the SMD package drawing. Technicians use such sheets to confirm a replacement or a cross-reference for a failed rectifier on a power rail, but should read the actual marking on the board component and compare the package before swapping.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.