Stored as a 102 KB PDF, this document bears the semiconductor designation 2SC4457 and nothing more. Per the JIS standard, 2SC indicates an NPN bipolar transistor of the high-frequency category, so it is likely a datasheet rather than a circuit drawing. Any PDF reader opens it. Check the pinout and package before desoldering, use the ratings table to judge whether a cross-reference part is safe, and make sure the code printed on the component really corresponds to this number.
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.