PDF document of 275 KB for the 2N5883, with an RE suffix the name does not explain, possibly a revision marker. It sits in the schematic category but is almost certainly a datasheet. JEDEC 2N numbers identify two-junction discrete devices. Technicians refer to such sheets for lead identification, outline drawings, safe operating limits and characteristic graphs. Typical uses are diagnosing a shorted output device, verifying polarity and choosing an equivalent with enough headroom.
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.