Indexed as a schematic, this PDF of 130 KB carries the code 50WQ10FN and nothing about a device or board. The code appears to be a component part number, and the trailing letters may indicate a package or ordering variant, so the file is most likely a datasheet. Repair technicians consult such documents for pin identification, forward-voltage and current limits, and footprint size when sourcing a replacement. Check the marking on the part itself, because neighbouring codes in the same family differ in rating.
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.