Filed as a schematic, this 93.5 KB PDF is identified solely by 2SJ274. The Japanese JIS 2SJ prefix stands for a P-channel field-effect transistor, so the content is most plausibly that component's datasheet. It serves repair work by giving absolute maximum ratings, electrical characteristics and the package drawing needed to test the part with a meter or select a cross-reference. Any PDF reader opens it. Read the marking on the transistor you are replacing and confirm channel polarity and pinout before committing to an alternative.
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.