Small 37.9 KB PDF for the 2SC4715, with an _E suffix in the name whose meaning is not stated, possibly a language or document edition marker. The 2SC prefix follows JIS numbering for NPN bipolar transistors, so this schematic-category file is most likely a datasheet. Technicians use such documents to look up pin assignment, package, gain and maximum ratings when testing or substituting a transistor, and should check that the part marking on the board agrees with the 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.