Named after transistor 2SC4452, this 98.8 KB PDF is listed as a schematic but most likely contains the component datasheet. JIS registration codes beginning with 2SC cover NPN bipolar devices for high-frequency service. Nothing about package or manufacturer appears in the name itself. Technicians rely on such documents to confirm which leg is base, collector or emitter, to read voltage and current limits, and to compare candidate substitutes before soldering one onto a damaged board.
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.