Named after the JIS part number 2SC2816, this 50 KB PDF appears in the schematic category but most likely contains the datasheet of an NPN bipolar transistor, as the 2SC prefix denotes. Nothing else about maker, package or revision is given. A short sheet like this typically covers pin connections, maximum ratings and main electrical characteristics. Use it to test a suspect transistor correctly and to evaluate replacements, and check that the marking and package on the board match this part before relying on the values.
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.