A 50.5 KB PDF named 16cyq150c, listed as a schematic, although the name reads like a discrete semiconductor part number in the style of International Rectifier and Vishay Schottky rectifiers. If so, it is a component datasheet giving pinout, voltage and current ratings, forward drop and package outline. Use it to check a suspect rectifier with a meter in diode mode or to pick a substitute. Verify that the marking on the actual part matches before relying on the ratings.
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.