The 129 KB PDF is labelled 50WQ06FN and filed as a schematic, though the name states no device or board revision. Its pattern matches a component part code, apparently a lower-voltage relative of the 50WQ10FN, so the content is likely a datasheet with electrical characteristics and a mechanical drawing. A technician would open it to confirm the pinout and ratings of a suspect part or pick an equivalent. Always check the printed marking on the component before relying on the figures inside.
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.