PDF of 541 KB named only with the number 75006379, with nothing in the name identifying the device, maker or part it describes. The numeric pattern looks like a vendor document or catalogue reference, so the content has to be opened to determine whether it is a component datasheet or a circuit diagram. When such files are used during repair, confirm that part numbers and markings in the document match the component on the board before relying on any pinout, rating or schematic detail it contains.
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.