Catalogued as a schematic, this 114 KB PDF covers the 10ETF10 and 10ETF12 parts, two related devices in one document. The code looks like an International Rectifier or Vishay rectifier number, so the content is most likely a component datasheet with ratings, characteristic curves and package outline. Before swapping a shorted or open rectifier in a power supply, use it to check reverse voltage, forward current and pin orientation. Make sure the marking on the original part matches the number in the document.
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.