A 124 KB PDF concerning the 2SC5468, a Japanese 2SC-series part, the JIS designation for NPN transistors. It is filed as a schematic, but it is most probably a manufacturer datasheet with characteristic graphs, which would explain the larger size. Expect absolute maximum ratings, hFE and saturation data, switching figures and the package outline. Use it to confirm that a replacement fits electrically and mechanically, and to orient the pins correctly before testing or soldering.
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.