Named after the 2SD2282, this 129 KB PDF is most likely the transistor's datasheet, despite the schematic classification in the index. JIS numbering assigns the 2SD prefix to NPN transistors for low-frequency use, and the name adds no variant, revision or device information. A repair technician can take the pin assignment, breakdown ratings and maximum current from it to test a suspect part or select a suitable replacement. As the case marking often omits the 2S prefix, compare the full code and the package style before relying on the data.
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.