At 125 KB, this PDF is labelled 82CNQ030 and, despite its schematic category, most likely holds the datasheet for that dual Schottky rectifier in International Rectifier part naming. Nothing in the name points to a specific device or motherboard. Use it to look up package dimensions, terminal arrangement and electrical ratings before testing or substituting the part. An A-suffix variant also appears in the index, so confirm the exact marking on the component you are working on.
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.