Catalogued under schematics, the 121 KB PDF named 75HQ045 does not mention any laptop, brand or board number. The code follows a semiconductor part-number pattern, so the document is most likely a component datasheet with ratings, characteristic curves and mechanical drawing. It is useful when a rectifier in a power stage is suspected of failure and an equivalent must be selected with suitable current and voltage limits. Confirm the exact marking and package on the physical part before trusting the values here.
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.