Filed as a schematic, this 129 KB PDF carries the part number 100BGQ030, which matches a high-current Schottky rectifier designation, so it is most likely a component datasheet rather than a board drawing. Expect ratings such as forward voltage, reverse leakage and package outline. Technicians use such sheets to confirm a replacement diode in a power stage or adapter can handle the current and reverse voltage. Open it in any PDF reader and compare the marking on the part before substituting.
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.