Datasheet-style PDF of 130 KB for the component numbered 12CWQ04FN, although the catalogue lists it as a schematic. The name follows the International Rectifier naming pattern, where the digits in the middle typically mark a voltage grade within one series. Expect ratings tables, characteristic curves and a package outline. It helps when sourcing a replacement for a burnt or shorted rectifier, confirming orientation of the pins, and comparing with neighbouring parts in the same family before ordering.
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.