Datasheet-style PDF of 304 KB for the 2SC5716, a JIS-numbered NPN bipolar transistor, catalogued here as a schematic. The name carries no further detail beyond the part number. It is handy for verifying the pin layout when probing in circuit, reading maximum voltage, current and dissipation figures, and comparing gain ranges with candidate replacements. Open it in any PDF viewer, and confirm that the package outline matches the PCB footprint before soldering a substitute.
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.