Stored as a 131 KB PDF, 25ETS08S carries a name in the style of a discrete semiconductor part number, so expect a component datasheet despite the schematic label. No laptop or board information is contained in the name. Typical uses include confirming the pin layout and package, reading maximum voltage and current limits, and judging whether an alternative part is a safe drop-in replacement on a power input stage. Any PDF reader opens it; verify the component marking on the PCB matches the code exactly.
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.